The SX31 is a wireless Lavalier microphone. This microphone has a 200mAh capacity battery that can last up to 6 hours on a full charge. It has multi-function noise reduction, reverberation, monitoring, and automatic connection. This microphone has a transmission distance of 20M - 30M. Moreover, there are Type C mobile phones, iPhone mobiles, 3.5mm interface 3 in 1, 2.4G wireless technology, HD sound quality, automatic connection, noise reduction, reverb effect, omnidirectional radio, and strong battery life.