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Very light, surprisingly small and (at full brightness) very bright. The default dim setting is extremely dim, which will either be useful (it's great for not waking people up at night) or frustrating, depending on your usage. But double-click the on button (or press and hold from off) and you get full brightness, which is amazingly bright for a keychain LED. There's also a useful lock function for travelling.
The plastic shell, which is hard and glossy, looks pretty cheap (a matte of soft-touch finish would have much nicer). I'd guess the USB connector rubber cap won't last that long either. But as an economical, rechargeable and bright keyring LED, I'm pretty happy with it.
Was great until it died unexpectedly 6 months after purchase. I opened up the torch to find out why it wasn't charging, and it turns out that the battery wasn't properly connected, the wires were lose.
So having 6 months before I needed to charge the thing is pretty damn good.