3Pcs 12V Mini Hi-Fi PAM8610 2X10W Audio Stereo Amplifier Board Dual Channel  Feature:  Work: D Class Quiescent current: 20mA Operating voltage: DC7.5 V- 15V Rated output power: 10w + 10w (8Ω) Frequency response: 20Hz to 50KHz Recommended supply voltage: 12V， the center PIN of 12VDC is "+"  Package included:  3 x Audio Stereo Amplifier Board