Action button. Dual frequency GPS. Siren emits 88-decibal sound for help. Long battery life up to 36 hours. Heart Rate Zones and Running Form. Compass shows elevation incline longitude and latitude. Make Waypoints with Compass. Cellular capability - stay connected using cellular data. Temperature sensing. Take an ECG or blood oxygen levels. Crash and Fall Detection. IP6X Dust resistant. Water resistant up to 100 M. Titanium case is corrosion and impact resistant. Black/Gray Trail Loop band. Case size: 49mm x 44mm. Band fits 130-180mm wrists.