Handheld design, comfortable to hold and high quality. 2 buttons for easy operation. Stand-alone operation, no connection to computer/PC required, easy to use. Built-in individual LED lights and buzzer indicator. Reading distance is 0 - 6 cm. Can only copy 125KHz RFID cards, compatible with T5577, CET5200, EM4305 and EN4305. Parameter Read: / TK (EM4100 TK4100 etc) cards or keys Write: EM4305 CET5557 T5577 5200 EM4205 etc cards or keys (Note: does not support ) Built-in: individual LED lights and buzzer indicator, transceiver antenna Power supply: 3V (2 x AAA battery, not included) Times: Read/write 20000 times Size: ( L*W*H ): 115 x 70 x 30mm Weight: 85g Color: As shown Material: plastic Package Contents: 1 x RFID Copier 5 x Keyfobs 5 x Cards Only the above package contents, 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 +/- 1-3 cm.