Works for me

I dont know what you other guys are using but it worked perfectly for me on a iPhone 5c (iOS 7) and on a iPhone 5s (iOS 9). The only problem I have had is the factory cable attached to a Lifeproof adapter, fixed that with a 3rd party male to male threaded for Lifeproof case data cable.

PhlyingFish about Caldwell Precision Chronograph, v1.18