A card reader designed specifically for ncard usage features a lid that doubles as an OTG adapter for connecting to mobile phones. Not only is it compatible with the card reader, but it also allows smartphones to read USB flash drives, mice, keyboards, and other peripheral devices. For the convenience of mobile phone users, the card reader ingeniously includes a built-in SIM ejector tool, offering greater practicality and eliminating the hassle of searching for one. This makes it especially suitable for business users who frequently need to switch SIM cards or ncards.