1. Built-in high-frequency antenna designed for optimal depth performance, eliminates blind spots, and enables uninterrupted reading of the entire data card. 2. Enhanced keystroke frequency; the card size accommodates comprehensive data storage. 3. Provides stable data analysis with a low error rate. 4. Low-frequency antenna improves signal-to-noise ratio for faster recognition; compact and portable design meets diverse application needs. 5. No external antenna interface required—plug-and-play setup ensures ease of use and durability. Simple and convenient lithium battery removal; compatible with power banks for offline operation. Features a cost-effective, lightweight design for easy portability; not associated with original-relay devices. Product appearance, color, and printed text may vary slightly between batches; these variations do not affect functionality. Note: Accessory color and appearance are random, including coil color; specific selections cannot be requested and do not impact performance. Color: Black Material: PCB Package Contents: 1 x RFID Card Reader Kit Note: The package includes only the items listed above. Lighting and display differences may cause slight color variations between the product image and actual item. Measurement error allowance: +/- 1-3 cm.