STABLE SIGNAL & CLEAR SOUND. UHF wireless lavalier microphone system is less likely to subject to interference from local radio stations. Reliable signal within 50 feet. Perfect for live performance. ** NOT compatible with smart phones, computers, and Apple products. **Choose the other model K031B if you need a mic for computers. ** EASY-TO-READ LCD SCREEN. The screen on transmitter displays the transmitting frequency and remaining battery life, so no need to guess involved.The indicator of receiver will flash and turn green if low battery. You can know the microphone working status well during performance. UNIDIRECTIONAL LAV MIC. Cardioid polar pattern rejects unwanted noise. Included windscreen also reduces plosives, wind and breath sounds. Clip it as close to under your chin as possible and with the top of the windscreen pointing up towards your mouth. 20 SELECTABLE CHANNELS. Easily change to a clean channel if use with other wireless microphone system or experience interference. Good to be used for a mobile DJ. Work with speakers, mixers, amplifiers and sound boards that with 1/4" interface to output the sound. **The included adapter is only for the camera that has 3.5mm mic jack, not for phones or computers. ** UNIQUE ID CODE. Each wireless microphone unit has been set a unique ID code that allows the use of several K037 wireless lapel microphone at the same time without worrying about cross connecting issue.Allows multiple wireless mics used simultaneously. -Versatile and Compatible Microphone Support multiple wireless microphones work together at the same time. Works with PA System, Amplifier, Mixer, Audio Receiver, Camera as well. -Lightweight, Comfortable & Durable Headset or Lavalier mic are ideal for applications requiring maximum performance and mobility. Uni-directional condenser mic ensures clean transparent audio and enhanced vocal pickup. -Low-battery warnings Mic’s LCD and receiver indicator provide constant monitoring of battery. Remind to replace batteries, prevent interference and disconnection from lack of power. -Accessories Included Includes headset mic and lavalier microphone,wireless transmitter and receiver, windscreens and tie-clip,1/4" to 1/8" adapter-cable.