1: Power amplifier chip: rt7498e2: Protection mechanism: anti-reverse connection, undervoltage, overheating, overcurrent, short circuit protection3: Widely used4: Long-life ultra-quiet fan (blocked rotor does not burn, no noise)5: Simple to use and easy to understandProduct name: 2.1 channel Bluetooth audio power amplifier moduleProduct model: ZK-HT21for 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: TDA7498EAdapter power supply: DC15-36 V (under voltage protection below 9V, 12V power supply can also be supported)Adapted speakers: 30-200W, 4-8Output power:Left and right channels less than equal 160wSubwoofer less than equal 220wProtection mechanism: anti-reverse connection, undervoltage, overheating, overcurrent, short circuit protectionProduct size: 145x126x28mmProduct weight: net weight 327gTip: When the audio signal input is large enough and the power supply voltage/current is large enough, there will be enoughOutput 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:BlackMaterial:Composite MaterialsPackage Contents:1 * power amplifier board kitOnly 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.