Size:50x79x22mm (excluding 15mm of potentiometer projection), Operating voltage range:DC 9-25V (the current is above 3A, and it is recommended to be above 19-24V/4A if the power is higher), Audio input sensitivity: 600mv Dual channel horn: 4-8 Ω. Maximum output power: 50W (left channel)+50W (right channel) dual channel Dual channel output power: 12V/10+10W (8 Ω)/15+15W (4 Ω) 15V/13+13W (8 Ω)/25+25W (4 Ω) 19V/22+22W (8 Ω)/ 39+39W (4 Ω) 22-24V/ 32+32W (8 Ω). Note: The output power is related to the power supply voltage, horn impedance, and input. Generally, the power supply voltage is higher, and the supported output power be higher. Speakers with different impedances can support different output powers. Generally, the power of the horn is smaller and it is easier to achieve higher power. Color:As Shown Material:Electronic Component Package Contents: 1 * Digital amplifier board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.