Sale Price: $21.98

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Science World introduces the first principles of science. Clear text, related photographs and simple diagrams explain many of the mysteries of the world around us. The series also emphasises how our understanding of science is used to improve our daily lives. Light & Lasers. Topics covered in this book include light and darkness, how light travels, shadows, eclipses, reflection, refraction, how we see, lenses, lasers and their uses, and maximising light. Sound & Music. Sound gives us information about the world around us. People and animals communicate using sound. This book describes how sounds are made, how you hear them, how musical sounds vary, and how we can even feel sounds.

List Price: $189.00
Sale Price: $49.00
You save: $140.00 (74%)

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A presentation of the most advanced application of optical near-field microscopy to studies of fine metallic structures and related surface plasmons.

Sale Price: $54.00

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This tutorial text provides an overview of design principles for receivers used in optical communication systems, intended for practicing engineers. The author reviews technologies used to construct optical links and illustrates the flow of system performance specifications into receiver requirements. Photodetector fundamentals, associated statistics, characteristics and performance issues are presented, together with a tutorial on noise analysis and the specific techniques needed to model optical receivers.Contents - Preface - Acknowledgments - Glossary - Optical Communications - System Performance - Photodetection - Photodetectors - Receiver Noise Modeling - Receiver Front-End Design - Receiver Performance Analysis - Index

List Price: $49.95
Sale Price: $23.00
You save: $26.95 (54%)

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Description

Description

100% Satisfaction; Fast Shipment with UPS Ground?

Animated moving green and red star
Fully adjustable motion speed
Music active ( Voice control ) & Auto-mode
Wavelength/power: 532nm / 50mw (Green), 650nm / 100mw(Red)
Power: AC power supply input 110V-240V / 50-60Hz, output 5.0V / 1.0-1.5A
Dimension: 130*92*52 mm
Weight: NW: 0.6KG, GW: 0.7KG
Color: blue

Package include?

1 x Projector
1 x Free Tripod
1 x AC Adapter

1 x English Manual

Features

• Note: 100% Satisfaction
• Power: AC power supply input AC 110V-240V/50-60Hz
• Suitable places: Disco, ballrooms, KTV rooms, bars, stages, parties and hotels, etc.
• Red "stars" twinkle, run, hide-and-seek, and play automatically or according to music volumn.

Sale Price: $21.99

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Description

After being connected with Power and switched on,The Red and Green Laser Will emit numbers of Stars, Which Make You Feel Like Walking in The Sky. The Effect of the stars can Rotate Automatically (Speed Adjustable). When being Switched to Voice Activated Mode (Controlled by The Music Speed and Volume), It will Give Users a Fantastic and Moving Atmosphere.

Voice Controlled Strobe: The Strobe Speed Is changeable with The Rhythm of Sound.
Constant On and Self-Propelled: Built-in Programs Runs automatically. The Transpositiona Speed of The Pattern or Meteor Shower Self-Propelled Strobe is Adjustable.
Strobe Runs By Itself: Built-in Programs Runs Automatically with Strobe, Strobe Speed is Adjustable.

Please Kindly Note:
This Laser Show Projector Is Not A Toy for Children And Should Only Be Used by Adults.
Don't use it for More Than 4 Hours Straight So As to Prolong The Life of The Lasers.

What's In The Box
1 * RED / Green Laser Stage Lighting.
1 * Power Adapter (universal 100-240V).
1 * User Manual.
1 * Tripod.

ePathDirect After Service: 30 Days Money Back Guarantee, 12 Months Warranty!

Features

• Designed with A Very Handy Mounting Bracket, Which Allows It to Be Mounted On Walls And Ceilings,
• And Is Easily Adjustable To Be Aimed At Anywhere In The Room for Any Occasion.
• Laser Power: Red = 100mW, Purple = 100mW. Laser Diode: DPSS, Purple = 405nm, Red = 650nm. Motor: N1.8 High Precision Step Motor.
• Laser Color: Green + Red + Pink. Control Type: Automatic / Sound Activated.
• Shell Color: Blue. Power Source: Wall Adapter DC5-12V. Power Adapter: 100-250V, 50-60 Hz.
• Laser Stage Lighting Especially Useful for Parties, Disco, Dances, Balls, Raves, Bars, Nightclubs, Or Even Your Living Room.

List Price: $100.00
Sale Price: $11.88
You save: $88.12 (88%)

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QQ-Tech is a registered
trademark,QQ-Tech store is the only authorized seller to sell this laser.

This listing includes one high power green laser pointer pen and 5 Star Constellation different patterns, plus straight beam; each cap produces different patterns when you rotate it, Dazzling full sky stars;They are perfect to create constellations at home, especially for creating romance environment, such as party/bar/disco ect; Simply press the push button to turn it on or to shut it off automatically. however the device are not toys and should not be directed into peoples eyes or aimed at passing aircraft. Please use responsibly and enjoy the many capabilities of this Combo. LASER IS NOT SUITABLE FOR CHILDREN 10 AND UNDER! KEEP AWAY FROM EYES!!

Features

• Include: 1 x Green(532nm) Laser Pointer pen & 5 x Star Caps
• Expected Life: over 5,000 hours;Wavelength:532nm
• Rage:3 mails; works with 2 x AAA battery (not included)
• Output Mode: Constant Wave;Max Output power:< 5mW
• We will 100% solve problems with products if customers can contact us

List Price: $38.99
Sale Price: $24.88
You save: $14.11 (36%)

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Description

QQ-Tech is a registered trademark,QQ-Tech store is the only authorized seller to sell this laser.

Bring three colors constellation back home!
This listing includes 3 laser pens with Star Constellation Projection Caps: one green / one red / one blue violet laser pointer!
They are abosolutely lot fun for you to play or use in astronomy or just being cool.It's amazingly bright with a targeting distance of more than 2 miles. Its military grade and is insanely powerful. Press the push button to turn it on or push button to shut it off and release it to deactivate automatically. However these devices are not toys and should not be directed into peoples eyes or aimed at passing aircraft. Please use responsibly and enjoy the many capabilities of this Combo.LASER IS NOT SUITABLE FOR CHILDREN 10 AND UNDER! KEEP AWAY FROM EYES!!

Features

• 100% Brand New; Output Mode: Constant Wave
• Max Output power:< 5mW;Expected Life: over 8,000 hours
• Include: 1 x Green(532nm) &amp;amp;1 x Red(650nm) &amp;amp;1 x blue/ Purple(405nm) Laser Pointer Star ProjectorPower supply: AAA Batteries (not included)
• 7 days money back; 3 month replacement; buyer pays for shipping back
• be noted, Blue/Violet beam is much dimmer than green and red because human eyes are not sensitive to 405nm wavelength ,pictures just for demonstration

List Price: $1,224.00
Sale Price: $633.00
You save: $591.00 (48%)

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Tripp Lite's APS2424 3-function DC-to-AC inverter with auto line-to-battery transfer and integrated charging system serves as an extended run UPS, a standalone power source or an automotive inverter. Supplies up to 2400 watts of continuous 120V AC power from a 24V battery set or automotive DC source. PowerVerter APS Inverters accommodate "peak surge" demands by delivering more output power than their continuous rating. Compare the "Continuous" and "Peak Surge" wattage ratings, and you'll find PowerVerter Plus Inverters supply up to double their output to easily handle equipment start up and motor cycling requirements. A DoubleBoost feature provides up to 200% of the continuous output for up to 10 seconds, providing the extra power needed to cold start heavy-duty tools and equipment. An OverPower feature delivers up to 150% of the continuous output for up to 1 hour.

Features

• 2400 watts continuous output power; up to 4800 watts instantaneous power
• Extended peak surge power handles heavy connected loads
• Auto-transfer switching option for battery backup (UPS) operation
• Hardwire AC input/output; rugged moisture-resistant polycarbonate housing
• 1-year warranty

List Price: $159.95
Sale Price: $95.00
You save: $64.95 (41%)

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The Sony Xplod MEX-BT2700 helps keeps your hands on the steering wheel with Bluetooth hands-free, an integrated microphone, and audio streaming capabilities. Get an all-in-one Bluetooth hands-free calling and wireless audio package at an entry-level price, with the multiformat options, sound quality, and expandability features of top-of-the-line Xpl?d head units. AVRCP (Audio/Video Remote Control Profile) support lets you view track and other song information from your Bluetooth-enabled phone or portable music device on the stereo's display. When you're ready for a hands-on experience, the MEX-BT2700 supports MP3 and WMA playback on CD and lets you add satellite radio or HD Radio to your system. If 52W x 4 output power isn't enough, you also can add external amplifiers using the MEX-BT2700's front, rear, and subwoofer selectable preouts with LPF/HPF (Low Pass Filter/High Pass Filter) and tweak the output to each component to create the exact sound environment you want. And because the MEX-BT2700 is part of the Xplod line, you get bold styling and functionality on the front end with a 13-segment fluorescent display, key illumination, and front auxiliary input. On the inside, Sony Drive S technology means faster, more precise disc playback; a higher signal-to-noise ratio; a shock damper; and S-MOSFET output technology for maximum signal integrity and clean sound.

Welcome to a hands-free nation. The Sony MEX-BT2700 CD Receiver MP3/WMA Player features Bluetooth wireless technology for simple hands-free phone calls and audio streaming (with a Bluetooth compatible phone). This means you can now make and receive calls through you car's speaker system--letting you keep your hands on the wheel instead of your cell phone. High-end performance at an affordable price. Click to enlarge. Plug your compatible (non-Bluetooth enabled) audio player it into the Sony MEX-BT2700's front auxiliary input. Simple, intuitive controls. The MEX-BT2700 Bluetooth technology also lets you stream music files from your compatible device over your car speakers. Now you can listen to your tunes on those long commutes without all those pesky wires getting in the way. This means you can now make and receive calls through you car's speaker system--letting you keep your hands on the wheel instead of your cell phone. Connect Via Aux Input You also have the option of plugging your compatible (non-Bluetooth enabled) audio player it into the Sony MEX-BT2700's front auxiliary input to jam to your favorite tunes. Plays CDs, MP3, and WMA The MEX-BT2700 CD player crisply plays MP3 and WMA files--as well as commercial CDs you buy at your local retailer. You also have the option of adding Sony satellite radio for commercial-free music--or add a Sony HD Radio tuner for superb radio reception and extra programming from your local participating stations. This unit has a high power output of 52 watts x 4. Additionally, this receiver has a low-pass and high-pass filters and all come with a wireless remote for convenient control. Key Features Include: CD receiver with built-in amplifier (17 watts RMS CEA-2006/52 peak x 4 channels) Bluetooth wireless connectivity works with compatible cell phones, music players, and more Bluetooth features include hands-free calling, integrated microphone, high-quality audio streaming, and control of compatible equipment (no phone book transfer or Caller ID) Plays CDs, CD-Rs, and CD-RWs, including discs loaded with MP3 and WMA music files Detachable faceplate for added security rRemote control to easily navigate between songs. EQ3 3-band equalizer with preset sound curves Compatibility with Sony's iPod adapter, HD Radio tuner, and satellite radio Front auxiliary input for connecting compatible devices 4-channel preamp outputs (front, rear/sub) What's in the Box Sony MEX-BT2700 CD Receiver, manual

Features

• Detachable faceplate with 1-line LCD display
• HFP, A2DP, and AVRCP Profile Support
• SAT radio, HD radio and iPod control ready
• EQ3 Stage 2, 2-volt front, rear/sub selectable pre-outs
• Front auxiliary input

List Price: $55.99
Sale Price: $16.99
You save: $39.00 (70%)

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Pyle’s Blue Label series speakers don’t just sound great – they look great, too. Feast your eyes upon the azure curves of Pyle’s Blue Label series and you’ll agree. They’re great replacements for your vehicle’s factory speakers – you’ll hear the difference immediately. Included in this package is a pair of round 6.5” three-way 360 watt speakers – carrying the high, mid, and low end for a fuller range sound. The non-fatiguing butyl rubber surround keeps your speakers secure as well as extending the life of the product. A 1” high-temperature ASV voice coil provides the richest sound, ensuring low distortion and providing an open sound stage. The blue poly injection cone looks great and allows your music to resonate with full power. The 20 oz. magnet structure, 1” neodymium film dome midrange, and ¾” piezo tweeter are what power these speakers and allow for a 100 Hz – 20 kHz frequency response. Includes grills, wires, and mounting hardware. Trust Pyle to provide quality sound at a competitive price.

These 6.5-inch Pyle triaxials make a great replacement for your OEM speakers, with 360 Watts of peak power handling and the added definition of a coaxial system. Great sound and wicked looks in an affordable package. A great replacement for your OEM speakers. Click to enlarge. Neodymium film dome midrange and 3/4-inch Piezo tweeter. Blue poly injection cone. PL63BL Woofer The 6.5-inch woofers feature an eye-catching blue poly injection cone for plenty of stiffness without added weight. The 1-inch ASV voice coil is ready for high-temperature, high-wattage situations. The butyl rubber surround will withstand harsh vehicle environments--sunlight, extreme temperatures, moisture and so on--to give the speaker an extended lifetime. PL63BL Midrange/Tweeter A one-inch neodymium film dome midrange and 3/4-inch Piezo tweeter complete the package, and help provide smooth, detailed sound. PL63BL Specs Power Handling: 180 Watts RMS / 360 Watts Max Impedance: 4 Ohm Sensitivity: 89 Db Frequency Response: 90Hz - 20Khz Mounting Depth: 1.9" What's in the Box Pyle PL63BL Speakers (pair), Grilles, Speaker Cable, Mounting Hardware

Features

• 6.5-inch triaxial speaker with 360 Watts peak power handling
• Woofer features blue poly injection cone with butyl rubber surround, ASV voice coil
• One-inch neodymium film dome midrange and 3/4-inch Piezo tweeter
• Includes grilles, cable and mounting hardware
• Frequency response: 90 Hz - 20 kHhz