Only tried on, never used. Excerpt from the product description below: * 【Compatibility】This kit includes one chest strap, one smartphone holder, one 1/4 screw adapter, and one fixing screw. Compatible with GoPro herol2 heroll herol0 herog hero8 herof hero6 max Insta360 One R X2 X3 X4 RS DJI Action 3/4 Osmo Pocket 3. * 【POV Shooting Possible】By wearing this chest strap like clothing, you can shoot POV footage, freeing up both hands. * 【Quick Release】It can be locked by simply inserting it, and can be opened by pressing the switch and then moving it. * 【Angle Adjustment】The pitch angle can be adjusted by loosening the screw, and you can check the video immediately after shooting. * 【Elastic Belt】The chest strap is an elastic belt that increases friction with clothing and prevents shaking.