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 utilizes patented technology. This product is small and compact. MSR90 is a USB emulation keyboard interface that requires no driver or software installation. It can work on any system with keyboard input, including Word, Excel, or other text entry applications. 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 package content, other items are not included. Note: Lighting and different displays may cause slight color variations compared to the actual item. Measurement allows an error of +/- 1-3 cm.