Features: 1. Lavalier design, safe, portable and not easy to lose 2. Support digital music playback in various MP3 music formats 3. Can be used as a mobile flash drive to store MP3 songs or data anytime and anywhere 4. Can be used as a TF card reader 5. Adopt USB1.12.0 interface, support hot swap, both plug and play 6. Use a variety of operating platforms, support WIN98SEMEW7810 above version 7. No mechanical parts, anti-vibration, anti-electromagnetic interference 8. Built-in high-efficiency rechargeable lithium battery, long standby time Instructions for use: 1. Put the MP3 switch in the power-on state, turn the switch to ON, and start playing. The status light starts blinking. 2. Press the play button again to start in the paused state. 3. Press Volume Adjustment to adjust the size. 4. Press the front and back to adjust the song you want to listen to. 5. To stop playing, press Pause first to put the host in a paused state. 6. Turn the switch to OFF state. Shutdown complete. Precautions for use: 1. Please do not charge the MP3 with the USB port of the computer for more than 2 hours, otherwise it will easily cause the failure and damage of the built-in lithium battery of the MP3. 2. Please don't pay attention to the status of the MP3 or charger indicator light when charging, it will be fully charged in 1.5 hours, and the MP3 or charger indicator light will not change any status after fully charged. 3. Do not connect to the USB port of the computer for more than 2 hours at a time. When pulling out the MP3 from the computer, you must strictly follow the requirements of the computer operating system, delete the hardware first, and then unplug the MP3. Otherwise, it is very easy to cause the MP3 player to lose the software program. 4. When the new machine is in normal use, please do not upgrade the firmware of the MP3 player. Product parameters: 1. Memory card type: TF c