Features: Wireless connection design, easy to move freely. Clearly sound recording, ensure clear sound Clearly sound recording, ensure clear sound. Convenient charging, long battery, meet the demand for long time use. Noise reductions technology, reduce the interferences of the surrounding environment, improve the quality of recording. Hosts, speakers, teachers,and other people who need to move freely and maintain clear sound. Specifications: Size：about 4.4x4.4x1.50cm/1.73x1.73x0.59in Connection: 2.4Ghz Charging Time: about 1.5Hrs Wireless Connection：Support 100M Connection（ when Not with Obstacles ） Package Includes: 1Set Lapel Microphone note: Due to the problem of lighting effects there is certain tolerances in product, please understand. Please allow 0-1cm error due to the measurement.