Yanmai GF525 2 in 1 Broadcast 2.4G Wireless Lavalier Microphone Mini Clip-on Mic with LED Display Features: 1. Microphone volume adjustment, one-key noise reduction function, with LED display 2. Self-connection after booting, frequency is stable 3. 30 meters barrier-free and stable transmission 4. 10 hours of battery life, 1 hour of charging 5. Built-in microphone, real-time monitoring, clear sound, no lag, constant frequency 6. Support SLR, mobile phone, audio and other equipment connection 7. Support one-to-one and one-to-two modes of use, no serial frequency, flexible collocation, easy to deal with various scenarios 8. Multi-purpose, multi-compatible, making short video creation, Vlog shooting, live sound pickup, program interviews, online class teaching, etc. have good sound quality parameter: 1. Pointing type: omnidirectional 2. Working frequency band: 2.4GHz (private protocol) 3. Frequency response range: 20Hz~20kHz 4. Transmission distance: about 30 meters 5. Transmit power: less than 10dBm 6. Battery capacity: 3.7V350mAh 7. Charging port: Type-C 8. Rated input of charging interface: DC 5V500mA 9. Charging time: about 1 hour 10. Battery life: 10 hours 11. Working temperature: -10~45 degrees Celsius 12. Storage temperature: -20~60 degrees Celsius