UPC 695259096074

• Super mini volume: 1.85 x 2.11 cm
• Excellent noise control. When there is no audio input, you cannot hear any noise even you close to the speaker.
• Two-channel stereo, single 5V power supply, can directly drive any 4-8 ohms speakers. High output power, good sound quality.
• Unique non-LC filter Class-D digital power board, can directly use the USB as the power supply.
• Package Content : 10 Pcs x Super Mini Digital Power Amplifiers Board

Features: Can use the computer USB port 5V power supply, or using a mobile phone charger USB port 5V power supply, battery power can also be used, high efficiency:90 , can provide 3W +3 W output power in the 4? load and 5V power supply conditions, A class, B class amplifier such efficiency is only about 30 , D class amplifier is highly respected today, D class amplifier efficiency is extremely high, not because of temperature affect the sound quality, but do not add heat sink and take less space, noise canceling circuit was built in the amplifier board, power on / off without pop noise, module has a short-circuit current protection and over-temperature protection, Application: LCD TVs, monitors, Laptop, Portable Speakers, Portable DVD players, game consoles, Phone / speakerphone, Specifications: Operating voltage: 2.5V-5.5V, Speaker With:4-8ohms recommended:4 ohms, Speaker Power :2-8W, Size:21 x 18 x 3.4mm, Color:As the pics show, Net weight:1g, Package Contents: 10 x Amplifier Board, Note:Left and right channel output of the "negative" and can not be together, otherwise it will burn IC, and speaker should be connected before power on.