This board uses PAM8610 chip PAM8610 chip is 10W (per channel) D level stereo audio amplifier. High-quality voice reproduction function low THD + N (0.1%) without filter good PSRR new direct output to drive speakers without a low-pass filter. 10W at 10V power 8Ω load with 10% THD's. No filter low quiescent current ultra-low EMI with Shutdown / Mute noise cancellation. High efficiency of 90% low noise output-90dB operating voltage 7.5-15V low THD + N low quiescent current low power consumption low heat. With the flow / temperature / short circuit protection. Work: Class D Quiescent Current: 20mA Efficiency: 90% Rated output power: 10W +10 W (8Ω) Frequency response: 20Hz to 50KHz Operating voltage: DC7.5-15V Recommended supply voltage: 12V