Control board description: 1. SET button:Short press the SET button, the blue indicator light flashes quickly, the system enters the registration state, put your finger in the fingerprint collection area, fingerprint registration is successful when listening to music. When the system is in the registration state, you can register fingerprints continuously; if you do not need to add fingerprints, please wait a few seconds. Fingerprint module is activated by finger induction;The relay time can be adjusted by rotating the button;Registering fingerprints is very simple, just press the SET button to register fingerprints;The product is compact and easy to install;Can store up to 120 fingerprints KL202 is designed for low power consumption, the power supply is DC7.5-12V, the relay time can be adjusted by rotating the button, the relay time: 0.5-13 seconds. 2. Return to factory default:Press the SET button hear a long "Di" beep and music, indicating that the initialization operation was successful. 3. Set the relay time:Turn K2 to set the closing time of the relay to 0.5 to 13 seconds. The relay is a contact output, a switching signal, and no voltage output;4. Use:Press the finger, the relay closes after the fingerprint passes, and the closing time is determined by K2., Weight: 0.1322773572 pounds, Manufacturer: susaa