They have low power consumption and strong interference resistance. It can read cards bi-directionally and features intelligent indicator lights to alert when card data is read correctly. The refined magnetic installation structure ensures stable card reading and incorporates patented technology. This product is compact and small in size. MSR90 is a USB emulation keyboard interface that requires no additional driver or software. It is compatible with any system that supports keyboard input, including Word, Excel, or other text entry environments. MSR90 is a hand-swipe operated magnetic card reader with a USB interface, utilizing a highly integrated magnetic card decoding chip. Color: Black Material: Metal Package Contents: 1 x Reader Note: The package includes only the items listed above. Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error is allowed within +/- 1-3 cm.