When the computer is connected, a disk is displayed with software on it. Do not insert the battery when connecting to the computer. Wait for the disk to respond before proceeding. This product is not suitable for bank cards. It cannot write to electronic label stickers or electronic label cards (NTAG 213). If the device cannot be connected, do not insert the battery when connecting to the computer. Powered by 4 x AAA batteries (not included). Compact and portable design. Supports decoding and programming of various types of smart cards for access control systems. How to read and write standard RFID cards: 1. Press the "On/Off" button. 2. Place the card on the back of the device. The device will display a warning message — press "OK". 3. Place the card on the back of the device again and press "Scan". 4. The device will scan the card and display the card number. Color: Creamy white Material: Plastic Due to manufacturing variations, there may be slight differences in appearance, color, or printed text between units. These differences do not affect functionality. Accessories may vary in color and appearance; no specific requests accepted. Specifications: 5 x T5577 keychain/card Package contents: 1 x Smart Card Reader Kit Note: Colors may vary slightly due to lighting conditions and screen settings. Measurement tolerance: ±1–3 cm.