In reply to Ridge:
Well Iv'e never had a problem with them in hand luggage, but I always remove batteries where possible and tape over the terminals. For example I've just come back from another trip to South Russia via Moscow, Amsterdam and Newcastle with 2 head torches, 1 hand torch, 1 GPS, 2 FM transceivers, 2 mic's and my head set, no questions asked. I figure I'm better able to demonstrate things are safe when there available to look at. There again I might just have that honest face!