Ajax Wireless Security Range Extender "ReX", White//https://ajax.systems/products/rex/#specBlockCompatibility - All Ajax hubsMaximum connected devices (in a system with one range extender): Hub, Hub 2 — up to 99; Hub Plus — up to 149; Hub 2 Plus — up to 199Max number of connected ReX per hub; Hub — 1; Hub Plus/Hub 2/Hub 2 Plus — 5Power supply: 110-240 V from mains or 12 V when using 12V PSU for Hub/Hub Plus/ReXBuilt-in back-up battery: Li-Ion 2 А·h Up to 35 hours of offline operationOperating temperature range: From ?10°С to +40°СPermissible humidity: Up to 75%