Product name: 2.1 channel bluetooth audio amplifier moduleItem model number: -E30HBluetooth version: 5.1Input : Bluetooth+AUXAudio channel: 2.1 channelAudio output: left and right channels + subwoofer supply: above DC9-24V/3AVolume adjustment: high-end encoder knob adjustment, smooth feelFrequency range: 20Hz-30KHzSignal-to-noise ratio: 92dBOutput : 15W*2 (left and right channels) + 30W (subwoofer)Satellite box (left and right channel) suitable speaker: 5W-30W/4-16Subwoofer (subwoofer) adapter speaker: 5W-30W/4-8Protection mechanism: electrostatic protection, overcurrent protection, short circuit protection, overheating protectionUnique function: support Audio-APP controlProduct size: 73 x 70 x 24mmNote: The impedance of the adapted speaker is 4, and the supply cannot exceed 12V; the impedance of the adapted speaker is 8, and the supply cannot exceed 24Vcolor:BlackMaterial:PCB+MetalPackage Contents:1 x 2.1 channel bluetooth amplifier board1 x screwdriver1 x DC adapterOnly 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.