Box says 
Android 4.3 or newer - but not sure if this gets continuous android updates - definitely look that up before buying.

See pictures of box - some highlights mentioned on box include:

- Water and Dust Resistance

- Always-on Screen

- 9-axis Motion Sensors

- Typ 400 mAh

- Say "OK Google"

I can't take returns as this is an unopened item and I have never used it or registered it.