Product model: XY-AP100H Product name: Bluetooth digital power amplifier board Number of channels: left and right channels (stereo) Adapted horn: 30W~300W 4 Ω 8 Ω 16 Ω Bluetooth version: 5.0 Power supply voltage: DC5~26V (the higher the voltage, the greater the output power) Transmission distance: 15 meters (no blocking) Protection mechanism: power reverse connection protection, short circuit protection, self-recovery overheat protection Product size: 60 x 60 x 20mm Presenting cool features: Mobile App control supports Android and OS Note: The output power of the power supply should be the output power of the power amplifier, otherwise the sound quality be affected by 12V → 8 Ω/30W+30W, 4 Ω/40W+40W 15V → 8 Ω/36W+36W, 4 Ω/ 60W+60W 19V → 8 Ω/64W+64W, 4 Ω/ 90W+90W 24V → 4 Ω/80W+80W, 2 Ω/more than 100W+100W Material: PCB+metal colour: black Package Contents: 1 x AP100H power amplifier board 1 x DC adapter 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.