Green Lion 3 IN 1 Microphone with Type C, Lightning, and AUX connectivity offers dual microphone functionality, barrier free wireless transmission up to 20 to 30 meters, frequency response from 20 to 20KHz, and a signal to noise ratio of 64DBM, the receiver has an 80mAh battery and each microphone 60mAh, providing up to 5 hours of working time, with minimal 30ms transmission delay, and comes with a convenient carrying case for easy portability