device is constantly overheating... very inferior tech... LTE version... at least once, often several times a day the device buzzes to let me know its overheating, and limiting functionality.. then it switches into airplane mode.. and eventually it lets me know its finished its little hissy fit, and it will agree to work again... or, I get tired of waiting for it.... and just turn it off for a while. Very dissapointing.. new tech yes, but sooo buggy and poorly executed. I use the LTE version, and without a phone to bluetooth it too.. expect it to last 8 to 9 hours tops... I love Samsung phones, I had the galaxy watch 3 and loved it... but I have to say, avoid this one, sadly