I have had my tracker now for about two weeks. I will say I am so impessed with this little device. I was tempted to go "big"with a name brand purchase but I am very glad I did not and decided to go with this one. I wear my tracker all day and even to bed to track my sleep cycles. Overall, 5/5 as I have had no issues with the device, the app and accuracy. I would highly recommend this quality product. Thank you!