Screw it in like a normal bulb. When the power cuts out, it stays on, running from its built-in rechargeable battery. Unscrew it and it works as a hand-held lamp too.
Why it's useful
Lights up automatically in a power cut, so you're never fumbling in the dark.
Charges itself while the mains power is on.
Hook included, so you can hang it anywhere.
Good to know
This is an E27 screw-in bulb. Many UK ceiling lights use a B22 bayonet fitting, so check your light socket first; a cheap E27-to-B22 adaptor fits most UK lights.
