Autodialler unit Statebourne mains operated auto charger battery back up. Can be used with low level alarm mains model, cryoguard datalogger (when mains powered) and all Biosystem models. The Autodialler unit connects to an output port on any of the above models and receives a signal in the event of an Alarm condition. The Autodialler will then make a telephone connection to three numbers until an answer is received and a pre-recorded message is played.