I bought this to replace the battery on my Samsung Galaxy Note 5. It's a small heat gun. The exhaust nozzle is about half an inch in diameter and is sufficiently focused for smaller projects like the one I made. I really wanted that little concentrated heat to be used for my application as I didn't want to damage my phone's electronics while softening the adhesive holding the back cover in place. This heat gun heated up quickly and it was definitely hot enough for my project. A few more things about this heat gun. There is only one setting for this (no high/low settings like some heat guns). It's small and feels good in the hand. I'm very happy with it and will keep it in case I need to change the battery on another manufacturer's sealed devices.