[Usage Occasions]-- The Phone chest mount suits for skiing, ishing, biking, motorcycle, Hs-Free for commentary on the video. we aren't suggest use it shooting video when jumping running, When you turn on the "anti-shake" function of your phone, the effect of shooting video will be better.[Great Choice for POV/VLOG]-- The phone can be placed horizontally vertically, The design of J-Hook long screw can make the phone rotate 90, The size of this strap is easily adjustable, fit over even the largest winter jackets, fit to wide range body size.[Stable Structure]-- There are two non-slip rubber pads at the bottom top of the phone holder; When you use the mini wrench provided to fasten the long screw to the J-hook mount, The mobile phone clip will be in accordance with your adjusted angle, stable shooting, will not slide.[Quick Release]-- The smart phone chest strap mount with J-HOOK can be easily install remove your phone, which can be disassembled in even one second. It is very convenient.