1. Bluetooth version: 5.02. Transmission distance: within 10 meters3. Speaker diameter: 40 mm4. Frequency response range: 50-60Hz5. Signal to noise ratio: 75dB6. Power supply: external USB power supply7. Power supply: DC 5V8. Expansion storage: 16GB9. 5W full frequency 40 internal magnetic speaker10. The inclined plane is 45 degrees to expand the visual experience11. Built-in microphone, one key to complete incoming calls12. FM radio can be adjusted13. Weight: 440 grams14. Size: 12x12x11.7 cmFunction keys:1. Short press to power on/switch function, long press to power off2. Adjust the screen brightness, SLEEP automatically shuts down3. Long press the volume down, short press the previous song, adjust the clock-4. Play/pause/hands-free/long press/adjust clock, long press in FM mode to search for radio stations5. Long press the volume up, short press a song, adjust the clock +6. Long press to adjust alarm 1, short press to confirm alarm adjustment7. Long press to adjust alarm 2, short press to confirm alarm adjustment