They have small consumption and strong interference resistance. It can read card bi-directionally, has intelligent lights to alert if card data is read correctly. Exquisite magnetic installation structure makes card reading more stable and , which is our patented technology. This product is very small and compact. MSR90 is a USB emulation keyboard interface does not need any driver or software. It can work on , Word, Excel, or any keyboard type. MSR90 is hand swipe operated magnetic card reading machine with USB interface, adopting high integrated magnetic card decoding chip. Colour:black Material:Metal Package Contents: 1 x Reader Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.