Wireless mini Microphone,Clip-on Lavalier Microphone easily for use Receiver 6.3mm Jack plug Excellent Sound Quality Frequency response: 80-12500Hz Effective distance: 20m It is desired for Teaching, Meeting, Monitoring etc. Transmitter Power: 1x 6F22 9V battery(battery not include) Transmitter size: 100mm x 63mm x 21mm Receiver power: 1x AAA 1.5 battery(battery not include) Receiver size: 72 x 44 x 14mm Package included: 1pc x Transmitter 1pc x Receiver 1pc x Clip-on Microphone