https://www.youtube.com/watch?v=6mmKXybp154&feature=youtu.be use: - Reduce the chance of your phone accidentally falling - When controlling the phone, the fingers on the back of the machine can slide freely, and the fingers can easily control every space on the screen. - When you need to vacate your hands, wear them on your forearm - Stand the phone on the stage for easy viewing (not with shell) 1) Is the back of the machine stuck tightly? The back of the machine is basically the same as the back of the machine. In general, the market will try to pull down the strap on the phone than the customer. The customers who have tried are very satisfied with their adhesion. Grinding shell and soft shell Ok! Silicone and glass are not recommended Tips: The offer is limited to local (or overseas areas included), and is not responsible for any loss. If you need SF Express, you can add the shipping cost to the station to make up the difference (recommended), or choose SF to pay.