1) powerful uhf frequencies:the wireless lapel microphone system has powerful wireless signals,25 selectable uhf frequencies ,less prone to electric appliance interference and offers stable signal transmission.Reliable signal within the operating range up to 100-feet in open areas.Perfect for live performance. 2) plug and play: easy pairing, easy to use. No driver installation required。 plug the microphone or the lapel microphone into the microphone socket of the bodytransmitter, turn on the transmitter and receiver you are ready to go. 3) metal case and rechargeable: application context: suitable for live performances such as churches, weddings, school dramas, training, public speaking, interviews or recordings. The best choice for public speakers, missionaries and lecturers, and fitness instructors. Change the microphone volume and frequency from the body clip transmitter is easy. Both the body clip transmitter and the portable mini receiver are powered by rechargeable batteries.