1.By using the clip to attach to your collar, tie or other clothing, this wireless lavalier microphone can help you make the speech while having your hands free 2.This wireless microphone brings freedom so that you can to walk within the range of 20 meters without being stopped by the tangled cables 3.The mini size makes it easy to use and carry along. And it is easy to set up and use 4.As it is made of ABS, it is , durable and portable without adding too much burden when you are speaking 5.By providing good audio quality, this lapel microphone with FM transmitter and receiver can give you a hand when you are making a speech Suitable for:teacher,lecturer,scholar Frequency:80-12500HZ Output:600 Ohm Effective range:20m Transmitter power:1 x 1.5V AAA(not included) Receiver power:6F22 9V(Not included) Connectivity/Communication:Wireless microphone Form Factor:Lavalier/Lapel Set Type:Transmitter Sets Wireless Technology:FM Size: Transmitter size: 100x63x21mm Receiver size: 72*44*14mm Material:ABS Colour:black Package Contents: 1 * transmitter 1 * receiver Only 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.