Fangrui Product Details 1. 4g Wireless Office Conference Tour Guide Explainer One-way One-to-many Explainer Microphone 2. Note: Transmitter And Receiver Are Selected Separately And Can Be Matched Reasonably According To Your Needs 3. Operating Temperature: 55 - 125 Degrees Celsius 4. Talking Distance: About 100-150m Barrier-free Distance 5. Number Of Channels: 36 6. Frequency: 2.4ghz 7. Charging Interface: Type-c 8. Charging Input: Dc5v 1a 9. Material: Abs + Display 10. Battery Capacity: 11. - Transmitter: 1000mah 12. - Receiver: 1000mah 13. Size: 14. - Transmitter: About 13 X 5 X 2.5cm 15. - Receiver: About 8.1 X 4.5 X 1.9cm 16. Weight: 17. - Transmitter: About 62.2g 18. - Receiver: About 42g 19. Features: 20. Wireless Explainerreceiver Mainly Transmits The Voice Content Through The Device, And The Receiver Can Realise One Person To Explain And Many People To Listen Under The Same Channel 21. 2.4g Frequency Band, Strong Anti-interference Ability, High Confidentiality, Multi-channel 22. Channel Number, Signal And Other Basic Information Are Displayed Through The Oled Screen 23. Key, Knob Use, Simple Operation, Beautiful And Generous 24. Transmission Distance Is Far, 100-150 Metres Without Obstacle Distance 25. Packing List: 26. - Transmitterreceiver X 1 27. - Microphone ( Transmitter ) Earphone ( Receiver ) X 1 28. - Type-c Charging Cable X 1 29. - Lanyard X 1 30. - Instruction Manual X 1