I bought this Item a few years ago, after 6 months it stopped showing the time when i was on the ground and on the way to altitude, it wasn't working, i would have to hit the middle button when we took off for it to work but altitude was never correct. I sent it back to Para-sport to fix which they did but again im in the usa and they are in Italy, took 2 months to send and receive the item back b/c of customs and mail to Italy, Customer service was good and they provided me with a wrist strap at my request, which was nice. 6 months later i was at altitude and the altimeter stopped working and turned off, 2nd time it happened. the battery should last 2 years due to low energy saver but i dont beleive it was the battery. I contacted Para-sport and they asked me to send it back, i haven't sent it back b/c i want to jump with it again to see if a new battery will correct the issue,if not i'm asking for my money back. i wouldn't recommend this item due to my issues but it could have been just with my unit.