Dega Broadcast Power Changeover Unit. 2 x Powercon input A & B. Will automatically switch input if power fails. Input can also be switched by a button on the front panel or via linking pin 1&2 on the 9 pin din remote connector. The rest of the 9 pin din can be used to replicate the status LED’s. In very good used condition and fully tested. I always use plenty of packaging and the correct size box to ensure all items arrive undamaged. If you have any questions please ask.