It is a desktop EM card reader with USB interface. It reads the ID number from EM4100 card or compatible card. Once card is detected, the card number will be directly sent via USB interface, just like input number from an USB keyboard. Output format is programmable with configure card. Features: It is a 125KHz non-contact ID reader which is easy and stable to use. USB interface, plug and play, no need extra driver. 0-80mm reading distance. Built-in buzzer and LED for identification. Read the EM card inside ID number and send to PC via USB interface. The output format can be selected by configure card. Widely used at library, canteen, office building, hospital and other places. Specifications: Color: Black Power Input: USB from PC Interface: USB, 106bit/s, no need extra driver Working Distance: 0-80mm Frequency: 125KHz Operation Temperature: -30C to +60C Operation Humidity: 5%-95%RH non-condensing Audio/Visual Indication: LED and Buzzer Output USB Cable Length: Approx. 120cm / 47in Item Size: 94 * 60 * 10mm / 3.7 * 2.4 * 0.4in (L * W * H) Item Weight: 37g / 1.3oz Package Size: 13.5 * 9 * 3cm / 5.3 * 3.5 * 1.2in (L * W * H) Package Weight: 104g / 3.67oz Package List: 1 * ID Card Reader 1 * USB Cable 1 * Configure Card 2 * Test White Card