Features:1: Power amplifier chip: TDA7498E2: Protection mechanism: anti-reverse connection, undervoltage, overheating, overcurrent, short circuit protection3: Widely used4: Long-life ultra-quiet fan (locked rotor does not burn, no noise)5: Simple to use and easy to understandParameter:Product 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)Amplifier chip: TDA7498EAdapter power supply: DC15~36 V (under voltage protection below 9V, 12V power supply can also be supported)Adapted speakers: 30-200W, 4-8ΩOutput power: left and right channels ≤160w, Subwoofer≤220wProtection mechanism: anti-reverse connection, undervoltage, overheating, overcurrent, short circuit protectionProduct size: 145*126*28mmProduct weight: net weight 327g, including packaging 395gTip: 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!