ULTRALINK ULM300LAV Wireless Lavalier Microphone System once again breaks the affordability barrier, allowing users to work the room without the hassle and restriction of cables for a fantastically low price. The package includes a ULM300L Lavalier Microphone, a ULM300BP Belt-pack transmitter, and the ULM300RL single-channel wireless receiver.The custom-designed microphone capsule and transmitter are designed to offer high-quality sound optimized for speech. State-of-the-art transmitter operates in the 2.4 GHz frequency band, which is well out of the way of TV stations and cell phone towers. And since it is digitally encrypted, your signal gets through in all its pristine, high-definition quality without the random artifacts that often plague other wireless systems. The ULM300RL Single-channel Receiver tracks your every move, with a range of up to 100 feet (30 m). You get minimum 4 hours of performance time from a pair of AA alkaline batteries, which are available virtually anywhere on the planet.