1.By using the to attach to your collar, tie or other clothing, this wireless lavalier microphone can help you make the speech while having your hands free2.This wireless microphone brings freedom for you so that you can feel free to walk within the range of 20 meters without being stopped by the tangled cables3.The mini size makes it easy to use and carry along. And it is easy to set up and use4.As it is made of ABS, it is lightweight, durable and portable without adding too much burden when you are speaking5.By providing good audio quality, this lapel microphone with FM transmitter and receiver can give you a hand when you are making a speechSuitable for:teacher,lecturer,scholarFrequency:80-12500HZOutput:600 OhmEffective range:20mTransmitter :1 x 1.5V AAA(not included)Receiver :6F22 9V(Not included)Connectivity/Communication:Wirelessmicrophone Form Factor:Lavalier/LapelSet Type:Transmitter SetsWireless Technology:FMSize:Transmitter size: 100x63x21mmReceiver size: 72*44*14mmMaterial:ABSColour:blackPackage Contents:1 * transmitter1 * receiverOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.