They have low power consumption and strong interference resistance. It can read cards bidirectionally and has intelligent lights that warn when card data is read correctly. The excellent magnetic installation structure makes card reading more stable, which is patented technology. This product is very small and compact. MSR90 is a USB-emulated keyboard interface that doesn't require any driver or software. It can work with Word, Excel, or any keyboard type. MSR90 is a manually operated magnetic card reader with a USB interface, which uses an integrated magnetic card decoding chip. Color: Black Material: Metal Package Contents: 1 x Reader Only the above package contents are included; other items are not. Note: Lights and different screens may cause slight color differences between the item in the picture and the real one. The allowable measurement error is +/- 1-3 cm.