Cinema grade sound effects, subverting auditory imagination:Equipped with virtual 5.1 channel technology, it achieves a 360 ° 3D surround sound field with a single speaker, with high-energy power output below 100W, and a body that can produce cinema level sound waves! One click switch between MP3/TF card playback and classic FM radio, compatible with USB direct connection, perfect integration of retro and technology. performance, versatile control:5.1 Virtual Surround Sound:Immersive Sound Effects, Music, Radio Live;220V household fast charging+8-hour battery life: Powered by lithium battery, suitable for outdoor use in living rooms;Bluetooth 5.1+USB/TF card the third mock examination grade plastic box:Anti drop and wear-, Unlock N life scenarios with one device:Home Singing: 220V plug in power instantly forms into living room speaker, stable output with 55 Ω impedance without lagging;Square Dance Artifact: Large screen display+button operation, elders can quickly get started, rhythm can be controlled at any time;Office Companion: TF card insertion plays instantly, background music does not interrupt during work instructions:FM: After turning on, enter the radio mode, or the M key briefly to enter the radio mode, turn on the radio antenna, and long the play pause button in the radio mode. Enter automatic search mode, and after the search is complete, the up and down buttons to select a clear radio station. Mode/Loop: Short the M key to switch between radio/Bluetooth/TF card/USB flash drive freely, long to loop single and all. Number keys: In MP3 mode, enter numbers to select the desired track (e.g. enter 12 to select the 12th song), and in radio mode, enter numbers (e.g. enter 905 to select the 90.5MHz frequency). TF card: Insert TF card to play MP3 music. USB: Insert a USB drive to files. DC 5V: Connect the data cable to charge the machine. The red indicator light on t