YDA138 bluetooth Digital Amplifier Board 3.5mm Audio Class D Stereo 2 Channel Power

Features: ? Stereo Bluetooth Digital Amplifier Board Amplifier chip: YDA138 Operating voltage: 8.5~14VDC (power input with polarity protection) Recommended power supply: 12V DC current 2A Output power: 2X10W (8 ohms), 15W+15W (4 ohms) Output impedance: 4~10 Ohm Specifications Model: SW-HF187 Size: 38x60mm ? Package Included: ? 1 x Digital Amplifier Board ?