1. Built-In High-Frequency Antenna, Corresponding To The Antenna Depth, Eliminates Blind Spots, And Reads The Entire Data Card Without Interruption. 2. Increases Keystroke Frequency, The Card Size Can Hold All Data. Data Analysis Is Stable With Low Error Rate. 3. Low-Frequency Antenna Improves Signal-To-Noise Ratio, Provides Faster Recognition Speed, And Mobile Design Meets Practical Needs. 4. No External Antenna Interface, No Connection Required, Reducing Risk of Damage. 5. Easy To Remove Lithium Battery. (In Offline Mode, Compatible With Power Bank) Material: PC+Metal Color: Black Package Contents: 1 x RFID Card Reader Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. The measurement allowed error is +/- 1-3cm.