1: Power amplifier chip: rt7498e 2: Protection mechanism: anti-reverse connection, undervoltage, overheating, overcurrent, short circuit protection 3: Widely used 4: Long-life ultra-quiet fan (blocked rotor does not burn, no noise) 5: Simple to use and easy to understand Product name: 2.1 channel Bluetooth audio power amplifier module Product model: ZK-HT21 for Bluetooth version: 5.0 (unobstructed, 15 meters) Input method: AUX + for Bluetooth + USB (the dial button to switch modes and songs) Number of channels: 2.1 channels (left channel + right channel + subwoofer) Amplify chip: TDA7498E Adapter power supply: DC15-36 V (under voltage protection below 9V, 12V power supply can also be supported) Adapted speakers: 30-200W, 4-8 Output power: Left and right channels less than equal 160w Subwoofer less than equal 220w Protection mechanism: anti-reverse connection, undervoltage, overheating, overcurrent, short circuit protection Product size: 145x126x28mm Product weight: net weight 327g Tip: When the audio signal input is large enough and the power supply voltage/current is large enough, there will be enough Output Power! The higher the power supply voltage, the greater the output power, and the smaller the speaker impedance, the greater the output power! Please make sure that the power of the adaptor is greater than the actual working power of the amplifier! Colour:Black Material:Composite Materials Package Contents: 1 * power amplifier board kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.