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Product information: Power supply: DC 8-20V; 2.1 interface Recommened power supply(V): ±5-15 Gain bandwidth(MHz): 10 Power bandwidth(KHz): 140 Conversion rate(V/us): 9 Input Offset Voltage(mV): 5 MAX Input noise voltage(nV/Hz): 5 Common mode rejection ratio(dB): 70 Min Quiescent Current(mA): 8 Channel: 2 Audio input(Stereo input): Support various versions of bluetooth connection; with built-in CSR8630 bluetooth chip, V 4.0 bluetooth. This Amplifier has super software compatibility Instructions: After power on the amplifier, waiting for 3 seconds till the blue and red light flash alternately and then you can use your device to connect my bluetooth moudle-"H-DIY Audio"; the next time you use the amplifier, the device will automatically connect. Color of the amplifier board: Red Digital Amplifier Board Size: 82mmX50mmX15mm(L*W*H) Acryliccaseor Size: 104mmX70mmX26mm(L*W*H) Magnetic ottoman:Φ12mmX8mm(H) Package Includes 1 x Amplifier Board 1 x 3.5mm AUX audio wire 1 x Acryliccaseor Parts and components