Bluetooth version: 5.0 (without sunscreen, 15 meters) Output channel: 2.0 channel Chip model: AP3050D Working mode: class D Audio input: support bluetooth 5.0,AUX, U disk Play Rated output power: 50W+50W Frequency response: 20Hz to 20KHz Working voltage: DC8V to DC26V Recommended power voltage: DC19V Fit speaker parameters: 4-8 ohms NOTE: 1.For DIY---The outer casing is a material package, It needs to be assembled by itself, and the material package is given a screwdriver. 2.---Attention!The heat sink tape glue needs to be pasted to the chip by itself. 3.For use---The power switch on the board is standby switch. After the switch is off, the machine is in standby state with low power consumption. If the power is completely turned off or the DC plug on the machine can be unplugged for a long time. Colour:black Material:PCB+Plastic+Metal Size:56 x 50 x 18mm Package Contents: 20 amplifier board 20 x terminal 20 set x shell material package 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.