Nady MicroMGT-16XA MGT Version Woodwind Instrument Part No more tripping on cables! Connects your instrument to your amplifier wirelessly. Experience complete freedom of movement while playing. Portable -Take it anywhere! 16 UHF frequencies to match different environments. Ultra compact, portable pocket size MRX -16 receiver with  output plug & volume control - DIP-switch channel selection with transmitter infrared pairing for instant setup. Powered by one AA battery (not included) for extra portability. "MT-16A transmitter features a 30-degree angled  plug for use with either recessed or surface mounted jacks. Up to eight hours of battery life from a single AAA alkaline or NiMH rechargeable battery. Input level attenuation switch & internal audio level control. " Box contents: MRX-16 receiver with flexible wire  wave antenna, MT-16A instrument transmitter with  wave, permanently attached antenna, manual.