ITEM NAME:Mini Bluetooth Speaker Digital Amplifier Board USB Power Supply Receiver Mo C5G8 Mini Bluetooth Speaker Digital Amplifier Board USB Power Supply Receiver Mo C5G8 Audio input: bluetooth audio receiver Amplifier output power: 2×3W (output connect to speakers, can not output for amplifier) Driving speaker impedance: 4~8 Ohm Power supply interface: Micro-USB holder (connect to computer USB port or battery bank USB, both can supply 5V) Output Interface: 2.54 pitch, 4 pins Color: white Material: metal Size: 80*40*15mm Package included: 1x Amplifier Board Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Amplifier output power: 2×3W (output connect to speakers, can not output for amplifier). 1x Amplifier Board. Audio input: bluetooth audio receiver. Driving speaker impedance: 4~8 Ohm. Output Interface: 2.54 pitch, 4 pins.