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If you're the sort of person who finds it a challenge to wake up in the morning, you'll find it no trouble once you buy this! It's an alarm clock with a twist - in order to turn off the alarm, you need to use the four buttons on the front to input a code which the clock plays to you. If you don't input it correctly, it goes off for 30 seconds, louder, and then gives you another code. This keeps going until you either get it right, or 5 minutes have passed. Trust me, if you don't get it by then, you'll definitely be awake!
You have a few options with it - you can either have it play an alarm sound (it's loud, piercing and insistent - not the nicest sound to hear in the morning, which thus makes it the best alarm clock sound possible) or the radio station of your choice. I've found that the aerial, which is just a wire, has trouble picking up stations clearly, and is really quite dependent on where you are in the room, but that could just be weak signal in my area.
The other main option you have with it is how long the sequence of buttons is. You can choose between a sequence of 5, 8, or 13 lights, which means that if you can do the easier options with ease, there's something guaranteed to give your brain an early morning work-out.
In other news: it has a large glowing orange LCD screen which I've found can be difficult to see from certain angles, which reduces its function as a general clock slightly. However, apart from this, it's a very good clock, and looks well made, if not the sleekest design in the world.
Mensa / An alarm clock which requires you to put in a code before it turns off.