Powered by the sun Eclipse Rx monitors and records sun exposure from ultraviolet (UV) light – tracking both UVA and UVB radiation. The Eclipse Rx band syncs with a mobile app (currently available for iOS, Android app coming soon) where you enter information about your skin type and sunscreen use. The band and the app provide alerts, such as when to reapply sunscreen or move out of the sun. The band is water-resistant so it can be worn for swimming and for outdoor activities year-round.