Product name: 2.1 channel Bluetooth audio power amplifier moduleProduct model: ZK-HT21Bluetooth version: 5.0 (unobstructed, 15 meters)Input method: AUX+Bluetooth+USB (switching mode and song by dial button)Number of channels: 2.1 channels (left channel + right channel + subwoofer)Amplifier chip: TDA7498EAdapter power supply: DC15~36V (less than 9V undervoltage protection, 12V power supply can also be supported)Adapted speakers: 30-200W, 4-8QOutput power: left and right channels less than equal 160W; subwoofer less than equal 220WProtection mechanism: anti-reverse connection, undervoltage, overheating, overcurrent, short circuit protectiontype:Amplifier BoardColour:blackMaterial:plasticSize:145x126x28mmPackage Contents:1x 2.1 channel Bluetooth audio power amplifier module