Fangrui Product Details 1. Rolton K600 7.4v Bluetooth Audio Speaker Megaphone Voice Amplifier Without Transmitter 2. K600 Bluetooth Amplifier, No Button, Can Not Insert The Card, Can Not Be Inserted Into The U Disk Playback, Only The Amplifier Function 3. Note: The Need To Achieve The Wireless Function To Be Equipped With A Separate Transmitter Or Wireless Microphone. 4. Easy To Wear, Can Be Buckled In The Belt Or Pants On The Edge Of The Belt Can Also Be Used To Hang Waist Belt, Can Be Freely Adjusted 5. Bluetooth 5.0, Compatible With The Connection Of Mainstream Devices, Such As Cell Phones, Computers, Laptops, Tablets, Etc. 6. 7.4v High Voltage, Loud And High Power 7. Double Voice Coil Thou Iron Boron Speaker Double Mos Tube Double Voltage, Covering An Indoor Area Of 2000 Square Meters 8. Intelligent Noise Reduction, Restore Fidelity Sound Quality 9. The Whole Machine A Knob To Adjust The Switch Volume Mode, Simple Operation 10. Parameters: 11. Output Power: 10w 12. Material: Plastic 13. Microphone Output Interface: 3.5mm 14. Voltage: Dc3.7v - 7.4v 15. Battery Capacity: 3000 Mah Lithium 16. Weight: 149g 17. Size: 90 X 39.2 X 109.5mm 18. Product Standard Equipment: 19. Amplifier X 1 20. Headset Wired Microphone X 1 21. Belt X 1 22. Usb Charging Cable X 1 23. Microphone Cover X 2