The fingerprint module is activated through finger induction. The relay time can be adjusted by rotating the button. Registering fingerprints is straightforward; simply press the SET button to initiate fingerprint registration. This product is compact and easy to install. It can store up to 200 fingerprints. The control board is suitable for use in automobile ignition control, access control, and various other applications, with a wide input voltage range; it can connect to most compatible fingerprint modules. Input power: DC9V--24V. Control board standby current: 6mA (at DC12V). Output: relay, rated current 10A. Instructions for use: 1. Short press the setting key; the light will flash rapidly, indicating that you can register fingerprints. Each fingerprint should be pressed twice, and a music sound indicates successful registration. You can continue to register, but after 8 seconds without any registration, it will exit the registration state. 2. Long press the setting key until you hear a long sound followed by music sound; this indicates that initialization is successful and the factory value is restored. 3. Use: When function setting selects 1-2 connection, the relay closes for 10 seconds after a successful fingerprint scan; when the 2-3 connection is selected, the relay will close after the fingerprint is recognized and will release after pressing the fingerprint again. The relay will also be released after power off. Colour: silver Material: aluminum + PCB Size: 51.5 * 48mm Package Contents: 1 * Fingerprint control board 1 * Fingerprint module Only the above package content, other products are not included. Note: Lighting and different displays may cause the color of the item in the picture to differ slightly from the actual product. The acceptable measurement error is +/- 1-3cm.