Description: High-speed sound transmission technology,transmission distance is 40M. The sound is clearer, no feedback, low distortion, low noise. Makes the vocals are more prominent and true Plug and play, no further action; plug the headset microphone or the lapel mic into the bodypack transmitter, turn on the receiver and the transmitter, you are ready to go. The bodypack transmitter is powered by built in rechargeable battery, and the receiver requires 1x AA battery(Not Included) UHF frequencies for each channel, less prone to electric appliance interference and offers stable signal transmission and allows multiple sets working together without interference Two microphones: headset / lavalier microphone, switch freely to meet your needs in different situations Designed for vocal use in live performance, sound reinforcement, studio recording, class, public speaking and trainings, and mind Specification: Material: PP Frequency range: 60MHz-250MHz Frequency response: 75Hz-18KHz±3DB Size Chart: Microphone 6cmx9.2cmx2.2cm/2.36inchx3.62inchx0.87inch Receiver 11cmx4.5cm/4.33inchx1.77inch Package Includes: 1 Piece Lavalier Microphone 1 Piece Bodypack Transmitter 1 Piece Rechargeable Receiver Note: 1.Do not use it with audio device without "MIC IN" 2. The microphone without speaker.