Description 1. Built-In High-Frequency Antenna, Corresponding To The Antenna Depth, Eliminates Blind Spots, And Reads The Entire Data Card Without Interruption. 2. Increase The Frequency Of Keystrokes, The Size Of The Card Can Hold Everything. 3. The Data Analysis Is Completely Stable And The Error Rate Is Low. 4. The Low-Frequency Antenna Improves The Signal-To-Noise Ratio, The Recognition Speed Is Higher, And The Mobile Design Meets Needs. 5. No Antenna Interface, No Need To Connect, Easy To Damage. It Is Simple And Convenient To Cancel The Lithium Battery. (In Offline Mode, You Can Use The Power Bank) Except That It Has To Do With The for Original-Relay, It Has Low Cost, Light Weight And Convenient Transportation. Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Note:The color and appearance of the accessories are random, the coil color is random, no specification is accepted, and it does not affect the use. Colour:Black Material:PCB Package Contents: 1 * RFID Card Reader Kit 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.