What is it? A torch that works without batteries.

How? You crank a little handle, like the reel on a fishing rod.

A wind-up in more ways than one? No, it really works. Wind for 20 seconds and you get 10 minutes' light from three bright white low-energy light-emitting diodes (LEDs).

Very techie. What else? The new 2020 also has a rechargeable battery: 24 hours plugged to the mains gives you 45 minutes' light from a Xenon-filled bulb.

Big as a house, I suppose? Nine inches by five by four, weight 2.2 lbs.

Not for backpackers, then? Better for car boots, motorbike panniers, and round the house.

An arm and a leg? £39.95. But you don't buy batteries.

I can get a nice little Maglite for half that. Yes: but this one never goes out. And it spares you that pang of environmental guilt as you bung another handful of AAs in the bin.

Where do I get one? Ring 0800 731 3052 for stockists. They come in opaque yellow, or translucent clear or blue .

What's the alternative? That sinking feeling as your batteries die, the darkness closes in and the baying of the wolves sounds ever closer.