If you've used one of these gadgets can you give me a review, please.  I am most interested in how accurate do you have to be on spot for it to work?  Secondarily how reliable is it in actual use?  Thanks in advance for any assistance / guidance.  Russ

https://www.traintekllc.com/rapido-railcrew-on-off-remote-uncoupler/?gclid=EAIaIQobChMIqN2Bsqfp4AIVjiCtBh2zMA_GEAQYBSABEgI1J_D_BwE