If they are like the Thomson celebration they are a warm breeze and you need to keep your finger pressed on a button to keep them working! Very difficult.
Spooky... two questions from Bristol??? when are you goin.
I have always found them quite powerfu.
Not very powerfull, you have to keep the switch pressed in all the time. If you take your own you have to use an adapter, 2 pin (flat) American I think, and you have to go out into the passageway, so not ideal.