Specifics: 1. Product Model: XY-W50L 2. Product Name: 50W+50W Bluetooth Power Amplifier Board + Wifi Clock 3. Power Supply: DC8-24V/2A Or More 4. Clock Function: Wifi Timing + High-Precision Clock Chip Bluetooth Version: 5.0 5. Audio Input: Bluetooth+Aux+U Disk+Usb Sound Card 6. Audio Output: Passive Speaker + 3.5mm Interface Stereo Output 7. Volume Adjustment: High-End Encoder Knob Adjustment, Feel 8. Output Power: 50W*2 9. Compatible Speakers: 10W-100W /4Q-8Q 10. Protection Mechanism: Anti-Reverse Connection, Electrostatic Protection, Overcurrent Protection, Short Circuit Protection, Overheating Protection 11. Unique Function: Support Sinilink-App Control Signal Problem This Product Uses A Pcb Antenna. In The Case Of No Occlusion, The Visible Distance Of The Connection Can Reach 15 Meters. If You Can'T Find Bluetooth When You Use It, Or You Can'T Connect To Bluetooth, Consider It A Signal Problem. 1) When In Use, It Is More Than 2 Meters From The Router 2) Avoid Using It On A Metal Table, The Metal Table Will Affect The Pcb Antenna Signal 3) To Modify The Speaker, If It Is A Metal Case, The Antenna Must Be Led Out Of The Case, The Metal Will Shield The Signal. Note: Drive 4ohm Speakers, Power Supply 12V And Drive 8ohm Speakers, Power Supply 24V And Colour:black Material:ABS Size:72mm x 45mm x 31mm Package Contents: 1 x Screwdriver 1 x Dc Adapter 1 x Upper Cover 1 x Bare Board 1 x Lower Cover 4 x M2 x 26 Copper Posts 4 x M2 x 3 Screws 4 x M2 x 8 Screws 1 x Heat Sink 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.