I've been using this kit from Jaycar for 15 years for my attic water tank to turn on my pump 50 m away. https://www.jaycar.co.nz/433mhz-remote-switch-kit/p/KC5473 Mine has just died and Jaycar no longer keep them. Anyone got an old one ? What other options are there ? signal needs to go through a tin roof. Thanks Wallace 03 3237449