The Snom Vision 800 Series Expansion Module (Black) is compatible for the 8xx series next-generation IP desktop phones and other endpoints. The Vision features 16 programmable keys with two control keys. Each Snom 820 or 870 VoIP phone is capable of supporting three Vision modules. The 4.3" full-color and touch screen has a resolution of 272x480 pixels, with 24 bits color depth. Additionally the Snom Vision can be used as standalone device, like door opener, video monitoring, etc. It has a Gigabit port and 2 USB ports.