ZK-TB21 Bluetooth Amplifier Board
Input Voltage: DC 12V-24V
Max Power Output: 50W*2（R&L）+100W（Subwoofer）
Input Method: Bluetooth & AUX
Channel: 2.1 CH Stereo Output
Output Impedance：4-8Ω
Bluetooth Version：BT 5.0
Protection Functions: Reverse Connection Protection Short Circuit Protection Self-recovery Overheat Protection
Size: 120*100*22mm
Weight: 195g

NOTE:
Only when the audio input is sufficient and the power supply voltage/current input is sufficient, can there be enough power output.
The higher the power supply voltage, the greater the output power;
The smaller the impedance of the speaker, the greater the output power. It is recommended to use a 4Ω speaker.
Finally, please make sure that the power of the adapted power supply is greater than the actual working power of the AMP to ensure the maximum output power.

Warm Reminder:
The power switch on the board is a standby switch. After the switch is turned off, the machine is in a low-power standby state. To completely turn off the power or unplug it for a long time, you can unplug the DC plug on the machine. Properly increasing the voltage or reducing the speaker impedance can effectively increase the output power.

Packing Include:
ZK-TB21 Power Amplifier Board * 1
Protective Shell * 1 Set
DC Plug * 1
Screwdriver * 1
Knob * 5

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