Rechargeable Microphone No need to purchase additional AA batteries Microphone and receiver are built in 1200mAh rechargeable lithium ion battery Working time up to 7 hours plus with charging time of 3 to 4 hours Charging cable is included in the package supports charging the dual microphones and receiver in one cable at the same time Cool LED ring light runs in green charges in red and an upgraded clear white LED display UHF Wireless Microphone Pro The microphone adopts UHF frequency band use legal signal bands with US FCC ID open place UHF distance 240ft 75m signal stability Dynamic Vocal Microphone Built in dynamic unidirectional microphone core dB value 95dB Audio signal 48Khz Frequency response 50Hz 16Khz Vocal built in boost circuit design is clearer The outer shell of the microphone is alloy material which is harder lighter and more wear resistant this microphone has a better weight and grip experience for conference speech web podpodpodcast instruction church family party opening ceremony dance instructor promotion etc Easy to use and 15 adjustable channels Plug and play automatic connection press the microphone tail switch to turn on the microphone 15 adjustable frequency channel for each microphone if you use multiple microphones at the same time or noise click the switch at the end of the microphone to adjust the channel Keep each microphone channel number inconsistent to avoid interference Multiple Compatibility for XLR and 6 35mm 1 4 mic input devices Compatible with party speaker mixer singing machine amplifier PA system audio interface truck speaker system dome speaker system and more equipment with microphone input