Bluetooth connection range of 15 meters (no obstacles in between) Bluetooth version: 5.0 Input mode: AUX + Bluetooth Number of channels: 2.0 channel (left channel + right channel) Power amplifier chip: TDA7498E Adaptable power supply: DC12 ~ 32V ( 9V undervoltage protection, can also support 12V power supply) Adaptable speakers: 30-200W, 4-8 Output power: left and right channel 150W Protection mechanism: undervoltage, overheating, overcurrent, short-circuit protection Batch differences may lead to product appearance, text, color will be different, does not affect the use of Color: Black Material: PCB+metal Package Contents: 1 x amplifier board (need to install themselves) 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.