Here we offer you a and tiny desktop EM card reader with USB interface. He can read the ID number of 4100 EM card or other compatible cards. Once the card is noticed, the ID number of the card be sent directly via USB to the PC. new and High sensitivity and fast response USB interface, no driver is required He reads the number of the EM 4100 ID Card or compatible card Support for EM Card 4100 Dimensions: 95 x 61mm ower supply: USB PC Interface: USB, 106bit / s, no additional driver is needed Distance of operation: up to 8 cm Frequency: 125kHz Material: Plastic Packet content: 1X USB Proximity Reader ID Card 1X USB Cable Note: Light 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.