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This is a useful tool and at the same time a complete menace. It essentially scans all TV frequencies and acts as a universal remote control whereby you can take it out in public and start switching off TV's. If you take this into a PC World and hit the button, some angry store managers will be over immediately.
I would like to point out now that I don't just go for a walk down the high street turning off TV sets, I instead use it productively to turn off my own TV when I've lost the Sky+ remote for the 50 billionth time.
This is just a universal remote control with one button, universal that is, to all to TV's. It's easy to use since it only has one button, and takes around 10 seconds for most TV's. It does continue to scan for up to 60 seconds and sometimes it will need a second pressing to find a TV frequency that it can use. I can safely say this does work, but speed is everything, and it's not 100% there for me. I will knock a star off for this.
The build quality is not good. The plastic is not completely opaque and as such, you can see the circuits. To add to the problems it scratches easily, cracks easily, and despite being on a key ring is completely and utterly useless on a set of keys, as it will get damaged very quickly and look like a scuffed up blob of brownish mush. Good news though, the little red LED still works for me after 4 months of use. Most remote controls loose their LED to bad build quality but mine has survived well.
It comes on a keyring which is very handy and I did attach it to my keys when it first arrived but have since taken it off due to the questionable build quality and the impracticality of lugging this plastic black blob around with me in my pockets, and having people stare at it and question what it is. I tell them its a a GPS tracking device and I'm really a secret agent from MI6...
The box is brightly coloured and completely recyclable. On it there's lots of black and white faces with 50's hairstyles. This really was designed as a gimmick and the packaging reflects this. It's called an "environment control device" whereby you control the environment by turning off TV's for peace and quiet when out and about, but lets be honest back here on planet Earth for a second: This is bought by idiots like me who think they're big and clever because they can turn off TV's.
Overall then it's a gimmick, bought by people who want to use it for fun. It's not a complete waste of money but you shouldn't take it seriously either, it's a toy more than anything. Still... useful for when I've lost/broken/thrown the sky+ remote.