Handheld shape design, comfortable hand feel . 2 buttons for simple operations. Standalone operation, no need to connect with computer or PC, easy to use. Built-in individual LED lights and buzzer indicator. Reading distance is 0 - 6 cm. Can only copy 125 kHz RFID cards. Compatible with T5577, 5200, EM4305, EN4305. Read: 125 kHz ID (EM4100, TK4100, etc.) cards or keys Write: 5200, EM4305, T5577, 8310, 8268, etc. cards or keys Built-in individual LED lights, buzzer indicator, and transceiver antenna Power supply: 3 V (2 x AAA battery), battery not included Rated for 20,000 read/write cycles Note: Device is tested before shipment. If the card cannot be read, it may be an unsupported type. If the card cannot be written, it may be an unsupported or non-writable type. These cases are not device defects. Due to different production batches, variations in appearance, color, and printed text may occur. These do not affect functionality. Type: 1 Keyfob Color: Blue Material: Plastic Package Contents: 1 x RFID Card Reader Kit Only the above contents are included; other items are not part of the package. Note: Lighting and display differences may cause slight color variation between image and actual product. Measurement error allowed is +/- 1-3 cm.