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 exquisite magnetic installation structure ensures stable card reading and is based on our patented technology. This product is small and compact. MSR90 uses a USB emulation keyboard interface and does not require any driver or software. It can work on Windows, Word, Excel, or any application that accepts keyboard input. MSR90 is a hand-swipe operated magnetic card reader with USB interface, utilizing a highly integrated magnetic card decoding chip. Color: Black Material: Metal Package Contents: 1 x Reader Note: Light and different displays may cause the color of the item to vary slightly from the real thing. Measurement may vary by +/- 1-3 cm.