Not one but TWO Mini Q40s available. If you want both PM me quickly, if you only want one PM me quickly too. Make me an offer and cover the postage (no batteries included so they're very light - light, geddit! - and therefore postage will be minimal - probably £1 should be enough). Yes they work, they're yellow, they're Mini Q40s, they require 4 x AA batteries and they emit light with which you will find caving easier. They are not LEDs nor are they hand crafted from balsa.