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: SET button Short press the SET button, the blue indicator light flashes quickly, the system enters the registration state. Place your finger in the fingerprint collection area; fingerprint registration is successful when music plays. When the system is in the registration state, you can register fingerprints continuously. If no additional fingerprints are needed, wait a few seconds to exit. Fingerprint module is activated by finger induction. Relay time can be adjusted by rotating the button. Registering fingerprints is simple just press the SET button to register. The product is compact and easy to install. Can store up to 120 fingerprints. K202 is designed for low power consumption. Power supply: DC 10-24V. Relay time is adjustable via the button: 0.513 seconds. Set the relay time: Turn K2 to set the relay closing time between 0.5 and 13 seconds. The relay provides contact output (switching signal) with no voltage output. P1: Power supply: DC 1024V Output: Relay (Max current: 10A) Standby current: 15uA Fingerprint capacity: 120 P2: MX 1.0mm pitch 6-pin fingerprint module (compatible with R502, R502-A, R503) P3: MX 1.25mm pitch 6-pin fingerprint module (compatible with R300, R301T, R303, R303T, R305, R306, R307, R501) Color: 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 is included; other products are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance: +/- 13 cm.