Description: The audio amplifier board kit has dual tracks and subwoofer voice quality. It is an unassembled accessory kit, you can DIY assemable according to you actual needs. It is well designed, sealed potentiometer, rustproof and moisture-proof. Low noise, ensure comfortable and satisfactory use experience. Specification: Color: as shown Core type: 1 x TDA3777 Board size: about 76 x 58mm Input voltage: AC9-12V, DC12-18V Maximum output power: 10Wx2+30Wx1 Output impedance: 4-8 Frequency response: 20Hz-20KHz Sound track: dual track, 0.1 super bass Application: audios Recommend speakers: left and right channels 3-5inch, 4-8, within 30W; super bass 4-6.5inch, 4-8, within 30W Package included: 1 set x audio amplifier board  Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow slight deviation for the measurement data and make sure you do not mind before ordering. 3. The voltage of the external power supply interface is basically equal to the power supply voltage, please pay special attention to it if connect any external equipment.