Cisco 7921G ETSI. Display resolution: 176 x 220 pixels, Display diagonal: 50.8 mm (2 "). Supported network protocols: SCCP. Handset weight: 145 g. Compliance industry standards: 802.11a/b/e/g. Operating temperature range (T-T): 0 - 40 °C, Operating relative humidity range: 10 - 95 %, Storage temperature range (T-T): -30 - 60 °C