I think this is a fab gadget, a great prezzy for someone or just use it to torture you nearest and dearest -its a Sonic Grenade Alarm designed to waken even the heaviest sleeper! Get this for just £6.90 delivered from firebox - by using one of the £5 gift vouchers attached.
Description: Simply pull the pin on this amusingly heartless device, lob it into the sleeper's room, yell 'fire in the hole!' and run for cover. Within ten seconds a piercingly loud, spectacularly annoying noise will blast from this comedy grenade's innards, causing the sleeper to wake up and fast.
What makes the Sonic Grenade particularly effective (and hilarious) is the fact it can only be deactivated by replacing the pin, so victims have to get up and find you (and the pin) in order to silence its dreadful caterwauling.