Very helpful and informative
I've had this device a couple of months now and love it.  I ordered it while waiting on a CPAP machine, and it's comfortable to wear.  It has a sleep report that you can download and review that seems accurate - I see the times I've been up with the dog, etc, because there is a break in the recording.  The vibration I have set to 90% and level "Strong" and that works well for me; it wakes me up to breathe but can go right back to sleep.  I can use it two nights before charging.
Rating: 5 stars