Twin Sensor Doorbell NO.3036
●Activated by light sensor,'WELCOME'or
   "THANK YOU'sound announce the entering or leaving of visitor.
●The sensor range is 3-6 meters.
●Adjustable Entrance/Exit melody.
●High/Low volume control.
●Battery : 3 x AA
3 IN 1 Alarm NO.1088 Vistor Annunciator(AC) NO.6038 Visitor Annunciator(DC) NO.6638 PIR Sensor Eeminder NO.1238 Recordable Reminder NO.2036 Twin Sensor Doorbell NO.3036