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I bought my brother a sensor-pen for his last birthday, but being curious ended up opening it myself and having a good play with it before packing it back into its box. And I was quite pleased with myself. OK, it's a gimmick, but it actually works. Basically, it looks like an ordinary pen, and works like such - but in the top of the lid is a small but very bright red light. When you receive an incoming call to your mobile phone, this light on your pen will flash. This is great for situations like the library, or meetings with the boss etc. However, how useful is this when most phones have a vibrating function? Well, it still has it's benefits. You can have the phone in a desk-drawer, and be writing away with your pen and be alerted to the silent ringing. If you phone is in a thick-coat pocket, you may not hear it's ring nor feel it's buzz, but with your sensor pen sticking out of your pocket you'll probably still notice the call. It also claims to be able to detect secret CCTV cameras in hotel bedrooms - and while the thought of waving my pen in all the corners of my room, 007-style, watching for the red flash, is vaguely appealing - whether it actually would be of any practical use ever, ever at all, in your entire life, ever, is a different question Unfortunately, it has to have it's limits. It picks up any call within 5m or so. So on the train, it flashes to alert you that someone two seats behind you has just received a call. In terms of practicality it's fine - it writes just like an ordinary pen, and seems to be refillable with an ordinary ballpoint refill. It takes fairly standard watch-type batteries, it doesn't weigh much more than an ordinary pen. Basically, it does what it says on the tin - it will alert you to calls to your mobile phone if your phone is within 5m from you. If you think you need such a facility, then get one of these - because they do work.