Feature:1. This ZK 502C HIFI power amplifier board is made from quality printed circuit board, which is sturdy and durable.2. The ZK 502C HIFI power amplifier board adopts audio input with AUX and BT, two in one design.3. The potentiometer adjusts the volume through the switch, and it is easy to control the volume.4. This audio power amplifier is an ideal choice for DIY speakers. With filter inductor, the sound is clear.5. Adopting copper DC connectors and barrier terminals. Can withstand large currents, no heat, no damage to the wires, good wiring, and shortcircuit.Specification:Item Type: ZK 502C HIFI Power Amplifier BoardMaterial: Printed Circuit BoardPurpose: Power Amplifier BoardModel: ZK-502CChip: TPA3116D2 (with AM Interference Suppression Function)With or Without Filter: Yes (the Sound is More Round and Clear After Filtering)Adapted Power Supply Voltage: 5-27V (optional 9V/12V/15V18V/24V and Other Adapters, High Power Recommended High Voltage)Adapted Speakers: 30W~200W, 4-8Number of Channels: Left and Right Dual Channels (stereo)BT Version: 5.0BT Transmission Distance: 15 Meters (unobstructed)Protection Mechanism: Overvoltage, Undervoltage, Overheating, Dc Detection, Short Circuit ProtectionPower Supply Voltage: 12V 8 Ohm Speaker/12W (left Channel) + 12W 4 Ohm Speaker/20W+ 20W (right Channel)15V 8 Ohms/18W +18W, 4 Ohms/more Than 30W + 30W19V 8 Ohms/32W+32W, 4 Ohms/more Than 45W +45W24V 8 Ohms/38W+38W, 4 Ohms/more Than 55W +55W.Package List:1 xZK 502C HIFI Power Amplifier Board2 x Acrylic Board1 x Screwdriver9 x Screw4 x Brass Connecting Rod1 x Square Heat Sink1 x Gasket1 x Nut1 x Knob1 x CableNote:1.If the Audio Input is Sufficient and the Power Supply Voltage/current is Sufficient, There is Enough Output Power. the Higher the Power Supply Voltage, the Greater the Relative Power. Speakers with Different Impedances Will Have Different Output Power. in the Case of Sufficient Voltage and Current, the Greater the Ohm of the Speaker, the Smaller the Relative Sound Power. Please Make Sure That the Power of the Adapter is Greater Than the Actual Working Power of the Amplifier.2.The power switch on the board is the standby switch. After the switch is turned off, the machine is in the standby state with low power consumption. Turn off the power completely or unplug the DC plug on the machine for a long time.3.Use an adequate power adapter to connect the power amplifier board, otherwise the sound will be distorted.