Hi, I'm frequently in and out of our 16 cars at work when I'm out visiting clients. I use Maps to help me get where I'm going, and because Sometimes I'm out most of the workday (or more!), I need a charger of some kind. I've just lost what I think is my third car charger this year. Does anyone know of a car charger that will chime or make noise if it's forgotten? Maybe it could make a sound if it's connected to the car but not an iPhone? If I can't get something like that, I will consider upgrading to the iPhone 7 and battery case. Thanks!