Phonak Charger Go. This charger will only work with the Phonak Infinio Sphere CRT Hearing aids only, not the standard Infinio or any other Phonak hearing aid. It has a built in battery so you can charge it 3 times without connected to power. If your hearing aids didn't come with this charger originally it won't work with yours. Used but in excellent condition. Always good to have a spare charger just in case. With lead and UK plug. That's for looking.