Features 1、Dual Channel Output: Audio power amplifier module adopts stereo dual channel output to ensure continuous serial high power operation. 2、Strong Performance: The wide voltage input DC is 15 to 36V. This power amplifier board uses two TDA7498E high fidelity maximum output power up to 160W x 2 and 220W. 3、Treble and Bass Control: By adjusting the high and low frequency knobs of the ZK HT21 power amplifier board, you can make the sound more layered and make the bass more shocking. 4、Safety Protection: ZK HT21 bluetooth power amplifier board has multiple protection mechanisms to ensure its safe operation, which has short circuit protection, over current, over heat, and anti reverse protection. When an overload occurs, the device reports the fault condition to the processor to protect itself from damage. 5、High Compatibility: The DC adapters on the market (plug specification 5.5mm x 2.1mm) basically can meet the needs of the ZK HT21 Bluetooth power amplifier board. Specification Item Type: Audio Power Amplifier Module Model: ZK HT21 Material: PCB Bluetooth Version: 5.0 (no occlusion, 15m) Input Method: AUX, Bluetooth and USB (toggle mode and song with wheel keys) Number of Channels: 2.1 channels (left channel, right channel and subwoofer) Power Amplifier Chip: TDA7498E Adaptive Power Supply: DC15 to 36V (undervoltage protection below 9 V, also supporting 12 V power supply) Adapter Speaker: 30 to 200W, 4 to 8Ω Output Power: Left and right channels ≤ 160W Subwoofer ≤ 220W Protection Mechanism: Anti reverse connection, undervoltage, overheating, overcurrent, short circuit protection Package List 1 x Audio Power Amplifier Module 5 x Knobs 1 x Power Accessories 1 x Screwdriver Bit 2 x Shells 9 x Screws 8 x Nuts