Central control unit Central control unit operating temperature (T-T): -10 - 55 °C Wi-Fi standards: 802.11b, Wi-Fi 4 (802.11n), 802.11g Central control unit connectivity technology: ZigBee/Wi-Fi Wi-Fi (central control unit): Yes Central control unit dimensions (WxDxH): 68 x 68 x 24 mm Central control unit operating relative humidity (H-H): 0 - 95% Central control unit interface: RF Wireless Central control unit: Yes