Power supply: DC12-26V/8A or above(Suggest using a 26V 10A power supply for optimal performance) Bluetooth version: 5.3 Channels:2.1 Channel Amplifier Chip: TPA3116x2 Audio input: Bluetooth+AUX+U disk+PRE Out Audio output: passive speaker Volume adjustment: high-end encoder knob adjustment, smooth feel Frequency range: 20Hz-30KHz Signal-to-noise ratio: 92dB Adapter speaker: 60W-100W/4Ω-8Ω(Treble speaker) /150W-200W/3Ω-4Ω( speaker) Output power: 60Wx2 4Ω(Treble speaker)/150W 3Ω( speaker) Protection mechanism: static electricity, overvoltage, undervoltage, overheating, DC detection and short circuit protection function: support for Sinilink /PiLink -APP control(Consult customer service to obtain) Color: Black Material: ABS Package Contents: 1 x Class D audio decoding amplifier 1 x Screwdriver Only 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.