Suunto Traverse Alpha Features a rugged, knurled stainless steel bezel, durable water repellent nylon strap, and a premium scratch resistant sapphire crystal glass. Dial Size: 50mm, Thickness: 15mm Suunto's automatic shot detection technology keeps track of when and where you shoot, mapping the GPS coordinates of your location for later viewing Gps tracks your path, helping you find your way back using the automatic breadcrumb trail,Compatible with Suunto Movescount App (iOS and Android) Location-based moon Phase calendar with moon rise and moon set times helps you determine the best hunting and fishing times Suunto Traverse Alpha watches are handmade in Finland and have been tested against military standards (mil Std 810G)