SMAKN&reg; TPA3123 Digital Stereo Amplifier Class D Power Amp Kit Mini Audio Ampli Module 25Wx2 DC 10-25V Powered Working Voltage: DC 10-25V (please do not exceed 25V) Max Output: 25W x 2 (27V 4) , 20W x 2 (24V 4) Module chip:TPA3123 Input Spacing: 2.5mm Output Spacing: 5mm