--- title: Locate Mac and CRC from communicator description: Locate Mac and CRC from communicator --- [Skip to content](https://support.geoarm.com/honeywell/l3000lynxplus/locatemacandcrcfromcommunicator#main-content) English Show submenu for translations ![geoarm-by-alarmclub-logo-2024-transparent.png\]](https://support.geoarm.com/hs-fs/hubfs/geoarm-by-alarmclub-logo-2024-transparent.png?height=50&name=geoarm-by-alarmclub-logo-2024-transparent.png) Open main navigation Close main navigation - English Show submenu for translations - Visit GeoArm.com Visit GeoArm.com Hello. How can we help? - There are no suggestions because the search field is empty. 1. [Support Center](https://support.geoarm.com/?hsLang=en) 2. [Honeywell](https://support.geoarm.com/honeywell?hsLang=en) 3. [L3000 Lynx](https://support.geoarm.com/honeywell?hsLang=en#l3000-lynx) # Locate Mac and CRC from communicator 1) Push in the push tabs located on the panel's top side and open the back panel 2) Next to the backup battery is where the communicator lives in the panel  - here you should see Mac and CRC located on the communicator ![l3000-resideo-honeywell-home-lynx-plus-wireless-control-panel-10](https://support.geoarm.com/hs-fs/hubfs/l3000-resideo-honeywell-home-lynx-plus-wireless-control-panel-10.png?width=600&height=600&name=l3000-resideo-honeywell-home-lynx-plus-wireless-control-panel-10.png)   - [GeoArm](https://support.geoarm.com/geoarm?hsLang=en#main-content) - [FAQ](https://support.geoarm.com/geoarm?hsLang=en#faq) - [Update Credit Card](https://support.geoarm.com/geoarm?hsLang=en#update-credit-card) - [Geo-CT](https://support.geoarm.com/geoarm?hsLang=en#geo-ct) - [Geo-CTR](https://support.geoarm.com/geoarm?hsLang=en#geo-ctr) - [GeoAlarm App](https://support.geoarm.com/geoarm?hsLang=en#geoalarm-app) - 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