One To Two Mini Wireless Collar-clip Noise-cancelling Microphone With Charging Case 1. Charging current 50mA 2. Working current: 14.5mA 3. Power consumption of the whole machine: less than 16mA 4. Rated voltage: 3.7V 5. Wireless transmission: 2.4GHZ 6. Sound delay: less than 20mS 7. Sensitivity: (-38Db) 8. Adapter: 5V1A 9. Transmission distance: 20 meters 10. Microphone: 360-degree omnidirectional 11. Frequency response: 100Hz-10KHZ 12. Signal-to-noise ratio: 60dB 13. Input sound pressure level: 115dBSPL (MAX) 14. Sampling frequency and sampling depth: 32KHz 16bit 15. Input voltage: DC4.8-5.2V 16. Microphone battery capacity: 60mAh 17. Working time: 3-4h 18. Charging current: 200mA 19. Charging compartment battery capacity: 350mHA 20. Working time: 2 times (two transmitters are charged at the same time) 21. Adapter: 5V1A 22. One to two, two microphones can receive sound at the same time 23. CD-level sound quality, equipped with innovative three-level noise reduction, reverberation, three voice change (original voiceuncle voicegoddess voice) function 24. With memory function 25. 20 meters long-distance sound pickup 26. Equipped with storage box, compact and portable 27. Size: 54x53.7x18.5mm (including clip) 28. Weight: 40.8g