Features: Protect Function: Overheating Protect, Overcurrent Protect, Short Circuit Protect, Match Speaker:30-200W 4-8 Audio Input: BT+AUX With Bluetooth-compatible 5.0 and AUX audio input, achieving more stable and faster transmission Mini size and higher playability, easy to assemble and install. Specifications: Material:PCB Size:Approx.110x58x25mm/4.33x2.28x0.98in Model:YS-XPS Bluetooth-compatible Version: 5.0 Protect Function: Overheating Protect, Overcurrent Protect, Short Circuit Protect, Match Speaker:30-200W 4-8 Audio Input: BT+AUX Audio Output: Left /Right Channel Less Than 150W Note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Upper Board 1x Lower Board 1x PCB Board M2x3+3 Copper Postx4 4xM2x18 Copper Post 8x M2x3 Screws 1x Knob 1x Screwdriver