... call system has CE Emergency/Wireless Call Button, Hospital Equipment, Bedhead Button, Measuring 85 x 85 x 18mm ... be serviced could press the button to get attendantMaintenance free: Enhanced designed for durabilitySpecificationsPhysical dimension: 85 ... for 4 hoursSystem requirements:Main unit (controller): GDH100, GDH400 GDH 500, GDH300 GDH500 good quality of wireless patient calling button for ...