Fangrui Product Details 1. Rolton K500 Bluetooth Audio Speaker Megaphone Voice Amplifier Support Fm Tf Recording 2. Bluetooth Wireless Transmission, More Convenient To Use 3. Thin And Light, Compact, 158 Grams, Thickness Of 3.9 Cm Or So 4. High-fidelity Microphone, Double-layer Pvc Line, Strong Resistance To Pulling, Good Shielding 5. Frequency Intelligent Amplifier System: In The Radio State, The Amplifier Automatically Turns Into Ab Class Anti-interference Amplification Mode; In Other Modes, The Amplifier Turns Into D Class Power-saving Mode 6. Support Mp3 Wma Wav Lossless Format 7. Support 32gb Tf Card Expansion Fm Radio Station Radio (tf Card Not Included) 8. One-touch Recording And Playback (please Insert A Wired Microphone For Recording) 9. Note: The Model To Achieve The Wireless Function, You Need To Buy A Wireless Microphone Separately. 10. Parameters: 11. Basic Functions: Music Radio Microphone 12. Material Process: Uv Process + Abs Plastic 13. Rated Power: 5w 14. Separation: 80db 15. Distortion: (3.7v, 1khz, 1w) 16. Signal To Noise Ratio: 83db 17. Working Voltage: Dc3.7v 18. Charging Voltage: Dc5v 19. Li-ion Battery Capacity: 2200mah 20. Impedance: 2ω 21. Display: Led Display 22. Speaker: 2.5 Inches X 1 23. Audio Format: Mp3 Wma Wav 24. Firmware Upgrade: Yes 25. Machine Volume: 85mmx39mx117mm 26. Working Temperature: -5-40 Degrees Celsius 27. Package Includes: 28. 1 X Audio Speaker 29. 1 X Wired Headset Microphone 30. 1 X Waistband 31. 1 X Usb Data Cable 32. 1 X Instruction Manual