Specifications: Supply Voltage: DC 12-26V Recommended Power Supply: 24V DC >5A Chip Type: TPA3118 Channel Type: Left Channel, Right Channel, Subwoofer Output Power: 30W*2 + 60W*1 Subwoofer Output Match: 4/6/8 ohm Audio Output: Terminals Item Size: 95 * 85 * 25mm / 3.74 * 3.35 * 0.98in (L * W * H) Item Weight: 96g / 3.4oz Package Weight: 102g / 3.6oz The amplifier board adopts high quality TPA3118 digital amplifier chip as the core. Output power: 30W+30W+60W subwoofer, making it features high efficiency and high power. Features: Adopts high quality TPA3118 digital amplifier chip. Sound quality is very good, high efficiency and low-heat. 2*30W+60W 2.1 channels(left/right channel and subwoofer channel). Powered by DC 12-26V, wide input voltage. User can adjust the volume by themselves easily. Applicable speaker impedance: 4-8 ohm. Just connect the power supply and loudspeaker box, enjoy the pure digital music!