AASTRA RFP 22. Maximum operating distance: 1000 m. Interface: RJ-11. Dimensions (WxDxH): 151 x 125 x 40 mm, Weight: 200 g. Operating relative humidity range: 5 - 95 %, Storage temperature range (T-T): -5 - 45 °C, Storage relative humidity range: -25 - 70 %