I am using it with Avaya 2410 multi line office phone. I ordered a new one. The product has come without any battery, the packet clearly stating "Operates on one LR6 alkaline battery. Look at my other reviews. Im glad I did! I even drank a beer while I did it, and it went just fine. Budget about 3 hours to assemble and have No. They are about 8-1/8" and 10-1/4" . So, Love the Birk cause it fits in narrow, is super comfortable,Like most Birks, and the soft sink is very pretty. Maybe the package was damaged in shipping, but it’s not smooth gliding.