To me it is unusable. When I first connected the two holders it kind of ?gave? a little and I thought ?uh oh? but it just settled in place and has been good. the boots fitted perfect, was a bit worried because adidas boots Ive had in the past sometimes came up small. Way to go Samsung, no complaints. We restarted the phones, we uninstalled and reinstalled the app. After unboxing I was surprised to feel the heft of the product compared to some of the single strobe options we have on our other trucks. 10/10 Durability: This thing is resilient, you can drop it, splash water on it, it seems fully waterproof, should last a while. The waist hits me perfectly giving that sexy hourglass shape. By December of 2018 they were not usable anymore. They just want your money.