Konftel 300IP Conference Phone Temperature: 41-104F, Relative humidity: 2080% condensation free Power over Ethernet IEE 802.3af, AC adapter: 100240 V AC/13.5 V DC Kensington security slot as Anti-Theft Protection Ethernet: RJ45, AUX (headset/PA): Modular 4/4, Expansion microphones: Modular 4/4 Support for SD memory cards up to 2 GB