Enjoy a portable design, comfortable hand feel, and high quality. Features 2 buttons for simple operations. Operates independently, no connection to a computer/PC required, making it easy to use. Built-in individual LED lights and sound indicator. Reading distance is 0-6cm. Can only copy 125KHz RFID cards, compatible with T5577, CET5200, EM4305, and EN4305. Parameter reading: cards or keys / TK (EM4100 TK4100, etc.) Writing: cards or keys EM4305 CET5557 T5577 5200 EM4205 etc. Power supply: 3V (2 AAA batteries, not included) Time: Read/write more than 20,000 times Size: (L*W*H): 115 x 70 x 30 mm Weight: 85 g Color: as shown Material: plastic Package contents: 1 x RFID copier 5 x key fobs 5 x cards 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 look a little different. The measurement allowed error is +/- 1-3 cm.