Handheld shape design, comfortable hand feeling 2 buttons for simple operations. Standalone operation, no need to connect with computer - PC, easy to use. Built-in individual LED lights and buzzer indicator. Reading distance is 0 - 6cm. Can only copy 125KHz RFID card, Compatible with T5577, CET5200, EM4305 and EN4305. Parameter Read: EM - TK (EM4100 TK4100 etc) cards or keys Write: EM4305 CET5557 T5577 5200 EM4205 etc cards or Keys (Note: not support HID) Built-in: individual LED lights and buzzer indicator, ceiver antenna Power Supply: 3V (2 x AAA battery, not include) Times: Read - Write Greater than 20000 times Size: ( L x W x H ): 115 x 70 x 30mm Weight: 85g Colour:As Shown Material:plastic Package Contents: 1 x RFID Copier 5 x Keyfobs Tags 5 x card 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 and- 1-3cm.