Wireless mini Microphone，Clip-on Lavalier Microphone easily for useReceiver 6.3mm Jack plugExcellent Sound QualityFrequency response: 80-12500HzEffective distance: 20mIt is ideal for Teaching， Conference， Monitoring etc.Transmitter Power: 1x 6F22 9V battery(battery not include)Transmitter size: 100mm x 63mm x 21mmReceiver power: 1x AAA 1.5 battery(battery not include)Receiver size: 72mm x 44mm x 14mmPackage included:1pc x Transmitter1pc x Receiver1pc x Clip-on Microphone