You should only have one handset, I expect you have a spare one for some reason. Have you tried them to see if they both work? One of them is probably faulty and the other is the replacement.
Rob
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I've never come across two handsets for a twin axle. Have you got two control boxes in the caravan? What make and model is this mover? It sounds very strange so I think you'll need to practise in a big open space to see what does what.
Thanks Rob had a compass 540 before bought bailey cordoba last year but had it delivered and guy who brought van pitched it so i did not see him use park it when he left he gave the wheel locks and two remotes so it stuck in my head that it was a remote for either side as its pitched has not been used since so as you have pointed out makes sence now thank you very much nice one Richard.