The Nokia 3720 classic features a sealed, leak-proof design and durable materials. The battery cover, which protects both the battery and the internal circuitry of the device, is locked with a screw, making for worry-free usage in wet, dusty or muddy environments.As to be expected, the Nokia 3720 classic also offers exceptional battery performance as well as an LED flashlight, to complement its rugged design. The large and bright 2.2" display is perfect for following the route even in unfamiliar terrain.