Designed to be used in harsh environments, the high impact plastic shell minimizes impact while an aluminum interior frame provides structural strength. The 17.5-inch screen is fully readable in sunlight, and the high-definition (HD) 1080p, 16 x 9 aspect ratio camera provides a quality image of the field user and environment. The unit is based on a Cisco TelePresence System SX20 Quick Set codec (SX20) and supports H.323, and Session Initiation Protocol (SIP) dual stream up to 6 Mbps. You can also set up the Tactical in a mobile telepresence conference room scenario with an external microphone, camera, and monitor. The SX20 codec supports embedded capability for multipoint support with Cisco TelePresence MultiSite technology, enabling you to add three additional participants to a telepresence call.