Tangent ELM-Bt (ELM-Bt) Element Bt Control Panel. With today’s multi-purposing work stations, where desk space is at a premium, having a fully featured panel that is compact, fully featured and stylish enough to match its surroundings is a must. But, you’d expect that having a compact design means having to compromise ergonomics, features and control size. With the Element range, there is no compromise. Despite their small desk foot print, each Element offers full size controls which are ergonomically laid out, and best of all, there’s lots of them!