The watch worked great for about a week then it just stopped. Amazon has provided me with return authorization papers even though I didn't have original receipt that was sent with the watch. I've been ordering from amazon for a while and this is the first time I've had to return anything.... I'll write a follow up if something goes awry. BTW, I have 6.75 inch wrists and some may think it  big enough but I think not.  Any bigger wrist than mine & this definitely wouldn't have adequate size.