When doing strenuous exercise, please don't use the phone chest and Head strap mount kit for shooting mobile phone video, not suitable for running and jumping!!! Fearture: Quick release design, the Phone or camera can be quickly installed and removed without slowly screwing the screws when switching between chest strap/Head strap mpunt. Very convenient. Specification: · Application:mountain biking, skiing,snowboarding, motocross, paddle sports,wake boarding and other action sportsand more. · Material: PC+ABS Plastics+silicone · Color: Black · Fit for: adults 130 - 250 lbs. Package Included: · 1 x Chest Strap Mount · 1 x Head Strap mount · 2 x J-Hook Buckle · 2 x Long screw 1 x 360° Rotation phone holder1 x Protection lanyard1 x S-adapter