Features: 100W+100W Bluetooth-compatible 5.1 wireless connection, AUX audio input, 2.1 channel stereo output. Over-voltage for protection, under-voltage for protection, over-heat for protection, short-circuit for protection. It is recommended to use a DC9-24V power adapter with a current above 4A. With excellent sound quality. It ensures that even with high power operation for a long for time. Support Wuzhi audio app, you could modify BT name, password setting, adjustable remind sound, On/off reminder, sleeping sound, etc. Specifications: Material: Glass Size: approx 50x60x20x78mm/2x2.4x3.1in BT: 5.1 Applicable power supply: DC9-24V( Not AC) Audio input：BT+AUX+U Drive+USB Sound Card Package Includes: 1x Amplifier Board note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.