B attery powe r supply: 3 V (2 x AAA battery).not included. you can buy battery on your side Protable design: 115 x 70 x 30 mm Supports 125Khz EM4100 / EM410X or compatible cards and tags formats (HID standard NOT compatible) Full Set includes 1 x RFID 125KHz handheld copie Writable RFID EM4305 key tags or Cards(choose different option, send different keys or cards) EM4305 tag 7 colors available for selection (BlackRedGreenGrayYellowBlueOrange) You can select all one color,for example " please send red ". Or mixed color,for example "1pcs blue,1pcs red,1pcs yellow, 1pcs black, 1pcs green ". If not leave any messages, we will send by random, normally all in blue. Read:Put the inductive proximity card in the induction area and hold the read key(left one),the buzzer will sound emitted by bit, the green on, successful reader. If there is no reflection but only the power light is blinking, the reader fail. Copy:After successful read,put the blank card in the induction area and hold the copy key(right one), the buzzer sound emitted by bit,yellow light on,indicating that the copy --- successful. If there is no reflection but only the power light is blinking, the copy fails