Amazon
https://www.amazon.com/Latching-Function-Channel-Wireless-Controller/dp/B00VYV451O/ref=sr_1_4?crid=HHOUKAENCDVO&dchild=1&keywords=remote+kill+switch+12v&qid=1634648499&sprefix=remote+kill+s%2Caps%2C203&sr=8-4