Spy Gear's Spy Safe is a totally new way to lock up your valuables: a secret magnetic key! When the small key isn't attached to the safe, everything inside will be safe from thieves (your little sister), but as soon as you attach the key, the safe will automatically pop open (if upright). In addition, the safe's sleek siding allows you to hide it convincingly on a bookshelf! Another thing I tested was that you can only use the magnet included with the toy to unlock the safe. No other magnets will work! It can fit money, a small book, a cell phone, a CD, or even a video game! Personally, though, I hide chocolate bars from the kitchen (don't get any ideas)! And you don't need to worry about how many batteries you'll use up because it doesn't need any. All in all, it's a great toy for anyone who wants to feel like a real spy!