Product Description Proxmark3 RFID Card Reader + 5XT5577 Keychain IC/ID Key Printer, RFID Copier, NFC 5.0 Smart Chip Copying Programming Kit 1. Built-in high-frequency antenna, matched to antenna depth, eliminates blind spots and ensures uninterrupted reading of the entire data card. 2. Increased button frequency, compatible with cards of various sizes. 3. Completely stable data analysis with a low error rate. 4. Low-frequency antenna improves signal-to-noise ratio, resulting in higher recognition rate; mobile design meets various needs. 5. No antenna interface, no connection required, less prone to damage. Lithium battery is easy and quick to remove. (In offline mode, it can be powered by a power bank.) Besides being compatible with the original relay, it also has the advantages of low cost, light weight, and portability. Due to different batches, the product appearance, color, and printed text may vary, but this does not affect use. Accessory colors and appearances are random; coil colors are random, and specific styles cannot be requested. Color: Black Material: PCB Specifications: 5 T5577 keychains Package Contents: 1 x RFID reader kit This package only includes the above contents; other products are not included. Note: Light reflection and different monitors may cause the color of the item in the picture to be slightly different from the actual product. The permissible measurement error is +/- 1-3 cm.