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 utilizes patented technology. This product is compact and durable. MSR90 is a USB emulation keyboard interface that requires no additional driver or software. It is compatible with Windows, Word, Excel, or any application supporting keyboard input. MSR90 is a hand-swipe operated magnetic card reader with USB interface, incorporating a highly integrated magnetic card decoding chip. Color: Black Material: Metal Package Contents: 1 x Reader (only the above items included; other products not included) Note: Lighting and display differences may cause slight variations in color representation. Measurement allowance: +/- 1-3 cm.