[Usage Occasions]-- The Phone chest mount suits for skiing, ishing, biking, motorcycle, Hands-Free for commentary on the video. we aren't suggest use it shooting video when jumping and 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 and vertically, The design of J-Hook and 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 and 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 and remove your phone, which can be disassembled in even one second. It is very convenient.