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I use one of these, they're excellentThis will switch on / off a 5v dc device. You will need a 12v + and earth to power it. The clock / timer has an internal battery.
Amazon product ASIN B071D9H3JY
This one seems to be available with different operating voltages https://www.ebay.co.uk/itm/30447607...d=link&campid=5338547443&toolid=20001&mkevt=1 . Maybe it will do what you need.Sorry I should have said that I want it powered by 5v DC as well as controlling a 5v DC item.