certificate of compliance with the EN 50131 Grade 2 requirements works together with the VERSA control panels (version 1.09 or higher) when working as part of the wireless system, a controller is required to connect to the control panel: ABAX 2: ACU-220 or ACU-280 ABAX: ACU-120 or ACU-270 two-way encrypted radio communication in the 868 MHz frequency band range of radio communication in the open area: in ABAX 2: up to 800 m in ABAX: up to 800 m (with ACU-120) / up to 400 m (with ACU-270) LED indicators of the state of partitions and system white backlight of the display and keys reader of proximity cards/tags audible indication of selected events in the system FIRE, AUX and PANIC alarms triggered from keypad quick activation of selected arm mode using function keys remote configuration and updating of firmware tamper protection against opening of the enclosure and/or removal from the mount power supply: 2 CR123A 3 V batteries