Output : 15W*2 (left and right channels) + 30W (subwoofer) Satellite box (left and right channel) adapted speakers: 5W-30W/42-160 Subwoofer (subwoofer) adapted speakers: 5W-50W/40-8Q Protection mechanism: electrostatic protection, overcurrent protection, short circuit protection, overheating protection Unique functions: Support Sinolink-APP, modify Bluetooth name, set Bluetooth password, turn off/on the prompt tone Product : XY-E30H Name: 2.1 channel Bluetooth audio amplifier board module supply: DC9-24V/3A above Bluetooth version: 5.1 Audio channel: 2.1 channel Audio input: Bluetooth + AUX Audio output: left and right channels + subwoofer Volume adjustment: high-end encoder knob adjustment, smooth feel Frequency range: 20HZ-30KHZ Signal to noise : 92db colour:Black Material:plastic size:70 x 73 x 20mm Package Contents: 1 x 2.1 channel Bluetooth audio amplifier board module Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.