Item Type: Bluetooth Digital Power Amplifier Module <br>Material: PCB <br>Sound Input: AUX And BT <br>Voltage: DC12-24V <br>Channel: 2.1 (50W, 50W, 100W) <br>Bluetooth: 5.0 <br>Current>9A1、BLUETOOTH 5.0: Digital power amplifier module features Bluetooth 5.0 with a transmission range of up to 49 feet (unobstructed). Features a 3.5mm/0.1in AUX sound input jack. <br>2、MORE LAYERED SOUND: Bluetooth power amplifier board by adjusting the high and low frequency knobs of for ZK MT21, you can make the sound more layered and the bass more shocking. <br>3、CONVENIENT TO USE: Sound power amplifier board is easy to use, the DC adapter (plug size 5.5x2.1mm / 0.2x0.1in) on the market can basically meet the needs of for ZK MT21 Bluetooth power amplifier board. <br>4、MULTIPLE PROTECTION MECHANISMS: Amplifier board has various protection mechanisms to ensure its safe operation. It has short circuit protection, over current, overheat and anti reverse protection. <br>5、THOUGHTFUL DESIGN: When overload occurs, Bluetooth digital power amplifier module will report the fault condition to the processor to preserve itself from damage.If your existing DC power plug is not 5.5x2.1mm / 0.2x0.1in, there is no problem because we include the DC conversion plug in the product.1 x <br> <br>Bluetooth&nbsp;Digital&nbsp;Power&nbsp;Amplifier&nbsp;Module<p>2 x Housing</p><p>1 x DC Conversion Plug</p><p>1 x Screwdriver</p><p>4 x Studs</p><p>13 x Screw</p>