Shure PSM 900 Q15, set consists of: 1x P9T InEar Transmitter and 1x P9RA Receiver, frequency range Q15 (750 - 790 MHz), Cue Mode to control upto 20 different InEar Mixes directly at the reciever, new and better Scan and Sync Modus to scan and send frequencies and settings, Audio Reference Combanding for powerful and clear InEar Sound, hard metal housing, audio frequency range 35 - 15.000 Hz, 20 frequencies parallel per frequency band, switchable HF-Power (10/50 mW), 3,5mm headphone jack output for earphones, receiver-Display witg frequency, AF and RF level and batterylife (5-segment), transmitter display with Name, Frequency, channel, HF power, transmitter with adjustable 3,5mm headphones out, sync-switch, HF-Mute switch, automatc HF limiter, 9,5" housing, works with 2x AA battery, dimensions reveiver: 83 x 65 x 22mm, weight 200g incl. batteries, dimensions transmitter: 197 x 166 x 42 mm, weight 850g, ickl. Rackmount and powersupply. Please note: Due to every country having different regulations, you may need to contact your local licensing authorities before using a wireless system.