b'52 Clockaudio -Tour Guide SystemGuided Tour SystemA licence-free (UK only) system of lightweight, 32 channel personal portable units developed for commentary or narration on guided tours, for individuals or for groups in situations such as museums, zoos, factories, garden tours or outside events. Also suitable for language tuition, talk-back and multi-language translation. UHF for reduced interference. 32 PLL selectable channels for easy and reliable operation. Built-in microphone or loudspeaker for hand held use and external microphone or earpiece for use when clipped to a belt or pocket. Open space range 100m. UHF PLL Licence-free 32 Selectable Channels Single or multi receiver capability Lightweight portable units with audio level adjustment Receiver with built-in loudspeaker for handhelduse, and external ear piece for use when clippedto a belt or pocket Transmitter with built-in condenser microphone for hand held use, and external microphone for use when clipped to a belt or pocket Powered by lithium rechargeable batteries giving up to 20 hours use on full charge Intelligent chargers for 2, 10, 20 and 30 units Accessories available - lanyard and disposableear padsModel:GT 400RGT 400TIncludesEar pieceOmni-directional Condenser Microphone GT 400T - Belt Pack TransmitterSystem FM CarrierUHF PLL SynthesizedUHF PLL SynthesizedFrequency RangeUHF 863 ~ 870MHzUHF 863 ~ 870MHzChannel Frequencies32 Pre-programmed switchable32 Pre-programmed switchableSwitchable Bandwidth12MHz12MHzFrequency Stability0.005%0.005%Maximum Deviation50KHz with level limiter50KHz with level limiterDynamic Range80dB80dB GT 400R - ReceiverFrequency Response150Hz ~ 10KHz-RF Output-10mWPoweringLithium batteries averagingLithium batteries averaging 20 hours use on full charge 20 hours use on full charge'