The skinmate

This UV detector gives you reminders to re-apply your sunscreen  through a skin-exposure reader that uses NASA inspired heat-sensor technology. It also helps detects the UV exposure on devices.

Specifications:
Dimensions: 48 x 66 x 6mm
System Requirements: iOS7+, Android 4.3+, Bluetooth 4.0 Transmission
Compatible with iOS7 or above, Android 4.3 or above, any other Bluetooth 4.0 device.
Lead Time: 4-6 weeks