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1. Self-recovery: press this button to turn on the power (light on);
Release your hand, the power will appear and turn off automatically (the light goes out)
2. Self-locking: press the power button, release your hand, and keep the button stationary (lit);
Press the button again to display and turn off the power (the light goes out).
"LED" "+": positive pole of the led
"LED" " - ": negative pole of the led
" NC ": Normal Close
" NO ": Normal Open
" C " : Common
