The Accessories kit not only use fo 4-7inch smartphone. Also compatible with all GoPro Hero cameras, Insta 360 ace pro X3 X2 X RS R GO 2 3, DJI OSMO Action 4, SJCAM, etc The Head Mounted Mobile Phone Holder is made of high-quality nylon material with good elasticity. The headband has three anti slip rubbers that can be directly worn on the head or helmet, making the headband more snug and less likely to slip off The phone clip is equipped with an anti slip silicone pad to prevent the phone from slipping. The range of the phone clip is 60-100mm, with a universal 1/4 screw interface at the bottom and back, suitable for most tripods. The phone holder can horizontal and vertical shooting, making shooting more diverse Mountaineering, skiing, fishing, cycling, motorcycle, POV/Vlog, Facebook live streaming, Head strap holder mount providing buyers with a first person perspective to shoot and present the real picture they see Note: This phone Head Strap Mount kit with small wrench, please use it to twist the long screw then tight the phone holder,the phone holder won't slide