ITEM NAME:PAM8406/5Wx2 Digital Speaker Amplifier Board with Volume Potentiometer DC 3~5.5V Description: Brand new and High quality Using imported PAM8406 digital amplifier chip, Ultra-thin and Small volume design, suitable for computer USB interface power. Adding a import 1000UF solid filter capacitor, Effectively solve the problem when used USB as power cause alternating current hum. Operating Voltage: DC 3-5.5V (Recommended) Max Output Power: 5W x 5W (Load 2 ohms) Board Size: 33 x 20mm Packing List: 1pcs x PAM8406 5Wx2 Digital Speaker Amplifier Board.1pcs x PAM8406 5Wx2 Digital Speaker Amplifier Board. Adding a import 1000UF solid filter capacitor, Effectively solve the problem when used USB as power cause alternating current hum. Max Output Power: 5W x 5W (Load 2 ohms).