b'Clockaudio -Tour Guide System 53Model:GT 420TGT 520TSystem FM CarrierUHF PLL SynthesizedUHF PLL synthesizedFrequency RangeUHF 863 ~ 870MHzUHF 863 ~ 870MHzChannel Frequencies32 Pre-programmed switchable32 Pre-programmed switchableFrequency Stability0.005%0.005%Maximum Deviation50KHz with level limiting50KHz with level limitingDynamic Range80dB80dBPowering2 x AA Ni-MH batteries averagingExternal 12v DC 500MA,10 hours use on full chargeAC Adaptor 115v ~ 230v ACDC 430 - Charging Flight Case (Transmitters sold separately)Model:DC 430 Charging Flight Case GT 420T - Hand Held TransmitterCapacity 30 (receiver or transmitter belt style only)Indicator LEDRed charging, green fully chargedCharging Current120mACharging TimeLithium 4 hoursCharging ControlPWM (timer power OFF detector)DC 402 2 Unit Desktop Charger (for hand held or belt style transmitter / receiver) DC 430 20 Unit 19 Rack Mounted Charger in fitted flight case GT 520T - TransmitterDC 402 - 2 unit desktop charger'