Handheld design for a comfortable grip and high quality. Features 2 buttons for simple operation. Standalone operation, no need to connect to a computer/PC, making it easy to use. Built-in individual LED lights and buzzer indicator. Read distance is 0 - 6cm. Can only copy 125KHz RFID cards, compatible with T5577, 5200, EM4305, EN4305. Parameter: Read: 125KHz ID (EM4100 TK4100 etc) cards or key fobs Write: 5200/EM4305/T5577/8310/8268 etc cards or key fobs Built-in: Individual LED lights and buzzer indicator, transceiver antenna Power Supply: 3V (2 x AAA batteries) not included. You can purchase batteries separately. Number of Writes: Read/Write 20,000 times Note: This product undergoes testing before shipment. If a card is not read, it may belong to an unsupported type. If a card cannot be written, it may be an unsupported or non-writable type. These situations do not indicate a device malfunction. Due to different production batches, there may be variations in product appearance, color, and printed text, which do not affect usage. Type: 125Khz RFID Card Reader + 3 Key Fobs + 2 Cards Kit Color: Blue Material: Plastic Package Contents: 1 * RFID Card Reader Kit (Note: Other products are not included.) (Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3 cm.)