APC 2-Port Serial Interface Expander SmartSlot Card. Host interface: SmartSlot. Width: 1207 mm, Depth: 1080 mm, Height: 381 mm. Operating temperature range (T-T): 0 - 35 °C, Storage temperature range (T-T): -15 - 65 °C, Operating relative humidity range: 0 - 95 %. Data link protocols: RS-232, Connectivity technology: Wired, Form factor: Plug-in