Fangrui Product Details 1 Wide Range Of Applications 2 App Has A Timer Shutdown Function 3 Supports Custom 10-segment Sound Effects To Be Adjusted Arbitrarily To Make Up For The Deficiencies, So That Different Speakers Can Achieve Better Sound Effects. 4 The Mechanical Switch Can Be Turned Off With One Turn, No Need To Wait For A Long Time, Which Is Convenient And Fast. 5 Support Wuzhi Audio App. Modify And Change For Bluetooth Name, Password Setting, Volume Adjustment Of Prompt Sound, On/off Prompt Sound, Sleep Aid, Sound Effect Selection + Custom Sound Effect, U Disk Playlist Adapter Power Supply: 9-24v/3a (can Not Be Connected To Ac) Bluetooth Version: 5.1 Audio Input: Bt+aux+usb+usb Sound Card Audio Output: Left Channel 30w + Right Channel 30w Volume Adjustment: Classic Mechanical Knob (with Volume Scale), Stepless Adjustment Switch Machine: Classic Mechanical Switch, One Turn Switch Machine, No Need To Wait For A Long Time. Adapter Speaker: 10-50w 8 Protection Mechanism: Overheating, Overcurrent, Short Circuit, Anti-stat