Function of automatic polling: if the customer writes access control data into the device, the device can automatically recognize and open the door. Our compact and versatile device supports cloning and emulation of various RFID tags and cards. This device enables creation of copies of RFID tags and cards for use in accessing secure areas or equipment requiring RFID authentication. It supports emulation and storage of multiple RFID card types (125 kHz and 13.56 MHz). This device is a useful tool for professionals and hobbyists working with RFID technology. Its compact and portable design allows for convenient use anywhere. Due to manufacturing variations, there may be slight differences in product appearance, color, and printed text — these do not affect functionality. Color: Black & Transparent Material: Plastic Package Contents: 1 x RFID Reader 5 x CUID Keychain (random color and appearance; specific color or appearance not guaranteed) 5 x CUID Card 2 x Adapter (random color and appearance; specific color or appearance not guaranteed; interface remains unchanged) 1 x USB Cable (random color; specific color not guaranteed) 1 x Lanyard Only the items listed above are included. Other products are not included. Note: Light reflection and display differences may cause slight color variation between the image and the actual product. Measurement tolerance is ±1–3 cm.