I purchased this gun safe light by #LNJAMI for my son's gun safe. He has a very nice and large gun safe in his closet which is quite dark.. It came yesterday and we immediately put this to the test. First of all it needs 3 AAA batteries (not included) which I had on hand and which he put into the light. Mounting was very easy and it is magnetic so batteries can easily be changed out. It has the built in PIR Sensor with 3-5 meter detection so that as soon as the gun safe's door opens the light comes on for easy access. So far it works just as described and my son couldn't be happier. He's a real gun enthusiast and loves his guns and ammo. He loves the fact that this light has not one light but 2 adjustable lights that can be positioned in opposite directions so that when he opens up his gun safe he can see both inside the gun safe and what's on the inside of the door itself. I have thought of other uses that this light can be used for too. Inside dark closets or cabinets especially in bathrooms like a linen closet would be ideal for this type of light. Dark Closets when looking for clothing is another great use for this product. At $19.97 this is a great price and if you're an Amazon Prime customer right now you'll save $2.00 and your cost is $17.97! So don't let this one slip away! Great overall design and product!