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: 1 x power amplifier board 1 x terminal 1 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. Product Notes: Please allow a little manual errors.Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please confirm acceptance before ordering. About Shipping: Please ensure your shipping informations are correct to avoid delivery issues. All orders are shipped within 3 days after payment. Delivery usually takes 8–12 days, The specific delivery time is depend on circumstances. If you have any questions during your purchase, feel free to contact us. We will respond you within 24 hours.