ITEM NAME:Xpt8871 Dc 3V 3.7V 5V Mono 5W Mini Amplifier Board Audio Amp Module One Ch Ew.DC3.7-5V 6W XPT8871 Mono Lithium Battery Power Amplifier Board Module. Power: Power: Stereo mono 6W. Features: anti-interference, good sound quality, low power consumption. Size: 20 x 16 x 8mm.