Review on TWTADE Electromagnetic Indicator Assurance Years）YJ4N GS by James Eledge

This relay/socket combo box comes with virtually no instructions. A somewhat cryptic circuit is printed on the relay case. Those already familiar with relay wiring will likely immediately recognize how it works; As a beginner, it took me some experimentation to get it right. It is solidly built and has a green LED that lights up to release excess coil voltage once the coil circuit is opened. The base looks like it's made for hanging onto something, but who knows what it might be? (Perhaps this is explained in a non-existent manual.)