Description: Product Name: 2.1 channel audio amplifier board Chip: TPA311602 x 2 Supply voltage: DC 12V-24V Output power: 50W x 2+100W subwoofer x 1 Output load: 4-8? Frequency response range: 14-100KHz Number of channels: 3 (left + right + subwoofer) Switching frequency: 1.2MHz Size: 100x70x30mm/3.94x2.75x1.18 inch Specification: 12V -- 8? speaker / 12W (left channel) + 12W (right channel), 4? speaker / 20 (left channel) + 20W (left channel) 15V -- 8? / 18 + 18W, 4? / ? 30 + 30W 19V -- 8? / 32 + 32W, 4? / ? 45 + 45W 24V -- 8? / 38 + 38W, 4? / ? 55 + 55W Package Includes: 1 Piece High Power Amplifiers