Genie STL - Perfect for mission critical STL point to point stereo connections between the studio and the transmitter site. 2 inputs and 2 outputs standard. It features built in backup power, silence detection and backup audio plus 2 streaming ports for failover between two different networks, you can rely on Genie to keep you on the air. Space saving 1RU design and options for *POTS and ISDN - Requires two Tieline Units