Specification: Item Type: BT Amplifier Board_x000D_Material: PCB_x000D_Sound Channel: 2.1_x000D_BT: 5.0_x000D_Input Mode: BT, AUX, USB_x000D_Power Supply: 12-24V, 5A_x000D_Sound Output: Left and Right Channel, Subwoofer, 3.5mm/0.1in Stereo Output_x000D_Frequency Range: 20Hz-30KHz_x000D_SNR: 92dB_x000D_Output Power: 50W x 2 (Left and Right Channel) and 100W (Subwoofer)_x000D_Left and Right Channel Matching Speakers: 10W- 100W, 4-8_x000D_Subwoofer Adaptable Speakers: 20W-200W, 4-8_x000D_Protection Mechanism: Electrostatic Protection, Over Current Protection, Short Circuit Protection, Overheating Protection_x000D_Special Features: Support for YS Audio APP Control Features: 1[Adjustment Knob] 2.1 channel BT digital amplifier board, left and right channel high and bass and subwoofer independent adjustment, 360 degrees stepless tuning. 2[HIFI Sound Quality] This BT power amplifier board supports AUX sound input, pure HIFI sound quality, treble pure and transparent, gentle and delicate midrange, bass shock. 3[APP Control] Wireless amplifier board supports for Android, for iOS system, APP visual operation playback mode, volume, sound, up and down song control, play pause, play mode. 4[High Output Power] Wireless subwoofer amplifier board supports maximum 50W (left channel), 50W (right channel) and 100W (subwoofer) channel output. 5[Safety Protection] This BT digital amplifier module has electrostatic protection, over current protection, short circuit protection, and overheating protection. PackageList: 1 xBTAmplifierBoard 2 x Cover Plate 6 x Knob Cover 1 x Heat Sink 1 x Sponge Sheet 1 x Screwdriver 8 x Golden Screw Post 9 x Black Screws