Color: GreenCan using the computer USB port 5V power supply or with a mobile phone charger USB interface 5V power supplyCan provide 3W (left channel) 3 W (right channel) output power at 4Ω load and 5V supply voltage conditionsModule comprises a short-circuit current protection and over temperature protectionSize: 21 x 18 x 3.4 mm (L x W x H)High efficiency: 90%A-Class, B-Class Amplifier efficiency as only about 30%Class D Amplifier is now highly respectedD-Class Amplifier efficiency is extremely high, not because of the temperature effect on the sound qualitybut not Add radiator and take up less spaceNoise reduction circuit in the Amplifier board builtPower on / off without pop noiseApplication: LCD TV devices, monitors, Laptop, portable Speakers, Portable DVD players, game consoles, Phone / HandsfreeOperating voltage: 2.5V to 5.5VSpeaker: 4-8ohms, recommended: 4 OhmSpeaker power: 2-8WPackage Contents:1 x Amplifier BoardNote: First, turn off and then Aktiv speakers or likely to cause damages to the chip; Because digital Volume control module has a large Volume, so do not be too much to leave the audio signal input signal Cut Limiter.Only the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.About UsWe provide the good product with the best price,we support Wholesale/Drop Shipping Order1. For Drop Shipping order, please remark"dropshipping order", we will prioritize it.2. For Wholesale/Drop Shipping orders, if you have any ideas about the price or package,please contact us in advance,we will give you the best service to satisfy your demands.About Shipments1.We will send out the orders ASAP once your payment is completed normally.2.Please write your complete delivery address with correct phone number and zip code, especially please confirm your full name.About After-sale ServiceWe are reliable seller and we have our professional after-sale service for all of our customs. If there is any question about the order,please contact us in advance ,we will always here until you get a happy answer.About Feedback1. Please check the package and item when you get carefully to make sure there is no problem.2. If you have any problem or are not entirely satisfied with your package,please don’t be hesitate to contact us first before leaving negative feedback. We will resolve the problem to satisfy you.1281. If there is no problem, please leave us five star positive feedback.Your affirmation is our greatest motivation ! ! !