Handheld shape design, comfortable hand feeling and . 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. (note : not support HID) Read: EM / TK (EM4100 TK4100 etc) cards or keys Write: EM4305 CET5557 T5577 5200 EM4205 etc cards or Keys Built-in: individual LED lights and buzzer indicator, transceiver antenna Power Supply: 3V (2 x AAA battery)(Battery not included) Times: Read / Write 20000 times Colour: Material:plastic+metal Package Contents: 1 x 125Khz EM Reader 10 x Buckle(Random Color, don't accept the specified color) 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 +/- 1-3cm.