Return to factory default:Press the SET button until you hear a long "Di" beep and music, indicating that the initialization operation was successful. 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 K202 is designed for low power consumption, the power supply is DC10-24V, the relay time can be adjusted by rotating the button, the relay time: 0.5-13 seconds. 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; P1: Power supply: DC10-24V Output: Relay (Max current: 10A) Standby current: 15uA Fingerprint capacity: 120 P2: MX 1.0mm pitch 6-pin fingerprint module (can be connected to R502, R502-A, R503) P3: MX 1.25mm pitch 6-pin fingerprint module (can be connected to R300, R301T, R303, R303T, R305, R306, R307, R501) Colour:black Material:Aluminum + PCB Package Contents: 1 x K202 fingerprint control board 1 x R503 fingerprint module 1 x R503-P dust and rain cover Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.