Lost it after about a week and device didn't find it before it probably ran out of battery power. Had just replaced the silicon cover with a smaller one since the original one used stretched out and fell off during the night. Placed on vanity, got distracted, came back in about 15 minutes and it was gone. I must have moved it elsewhere before the distraction, but can't remember where. I hate being old! Went through a nearby trashcan and laundry basket with no luck. Almost 2 weeks later now and still haven't found it. It really was great, though! Very comfortable to sleep with and got a lot of the data my doctor was looking for. I'll probably end up splurging to get another one next month.