... Selectable 2. 100m remote range 3. Low power consumption Wireless Door Chime, with Access Control System and 16 Melodies Selectable Extend ... up to 4 transmitters signal in one receiver, including front door, back door, garage and emergency alarmComes with 4 ID/zone alerts through ... to 1 yearReceiver up to 9 months:CE-marked Wireless Door Chime, with Access Control System and 16 Melodies Selectable