Here we offer you a high quality and tiny desktop card reader with USB interface.He can read the ID number of 4100 card or other compatible cards.Once the card is noticed, the ID number of the card will be sent directly via USB to the PC.Brand new and high qualityHigh sensitivity and fast responseUSB interface, no driver is requiredHe reads the number of the 4100 ID Card or compatible cardSupport for Card 4100Dimensions: 95 x 61mmower supply: USB PCInterface: USB, 106bit / s, no additional driver is neededDistance of operation: up to 8 cmFrequency: 125kHzMaterial:PlasticPacket content:1X USB Proximity Reader ID Card1X USB CableNote: 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.