DC5V-8V 8W 3960 Wireless Bluetooth Amplifier Board With Mobile Phone Call FunctionFeature:- Use two 8W amplifier chip: two chips to load the left and right channels、 high channel isolation、 outstanding stereo effect- Bluetooth module start-up immediately after accessing to power- 3960 bluetooth amplifier does not need to use NE5532 to signal buffer、 provide better sound quality- Use active phased power supply technology to provide high-precision power for bluetooth chip、 solved the problem that most of the bluetooth amplifier power off when   there is a voltage fluctuation caused by loud volume under 5V- Air heat conduction groove technology: the chip heat sink and the circuit board PCB are connected、 the emitted heat of the chip can be perfectly conducted to the bottom、   no need to worry about the overheat of the chip caused by volume up- With 4 buttons to increase the volume、 decreases the volume、 next song、 pause \/ play- Support phone calls and onboard microphone:  short press once to answer the phone 、 short press twice to dial your latest call、 long long press to turn off bluetoot h- DC 5V-8V working mode: support 5V voltage、 6V battery、 double lithium batteries (8V) to supply power、 and amplifier has 2200UF filter capacitor- Use OVC bluetooth module which can effectively enhance the sound quality、 no need for password to connect your deviceParameter:- Power:  8W (pure Class D)- Voltage: DC 5V - 8V- Connection distance: about 6 meters- Recommended Speaker: 4 ohm for 5W-8W; 8-12 ohm for 10W-130W (can only use 8 ohm speaker when over 8W)- Bluetooth V3.0 protocolNote:- The power supply voltage can not exceed 8V- The 4 cables of the left and right speakers are completely independent、 common connection is not allowed- Power capacity would need at least 1A 、 do not recommend to use a power bank to supply power- All reconstruction work must be carried out when the bluetooth amplifier is power off、 and soldering tool should be grounded、 in case of static damage to the bluetooth chip.Package included:1 x Module