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 reliable, 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, POS systems or any keyboard type.MSR90 is hand swipe operated magnetic card reading machine with USB interface,adopting high integrated magnetic card decoding chip.Colour:blackMaterial:MetalPackage Contents:1 x ReaderOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.