Card readers are divided into contact readers, contactless readers, single interface readers and dual interface readers, and multi-card contact readers. Card readers are mainly seen from the interface: parallel port reader, serial card reader, USB card reader, PCMICA card reader and IEEE 1394 card reader. The first two types of card readers have been basically eliminated due to slow interface speed or inconvenient installation. The USB card reader is currently the most popular card reader on the market. The PCMICA card reader is mainly used in notebook computers. The IEEE 1394 card reader is not popular because of the supported interfaces, and the application is not widely used. The main flash memory or multimedia cards on the market are: TF card, SM card, CF card, MicroDrive, MemoryStick, MemoryStick PRO, MMC card, Micro SD Card, MiniSD card, SD and SDHC, xD card. The smallest card reader is divided according to the type of flash memory read, and the card reader is divided into a single function card reader and a multi-function card reader. Single-function card readers can only read one type of flash memory card. For example, TF card readers can only read TF card flash cards, SM card readers can only read SM flash cards, and such card readers The price is lower, generally 10-30 yuan; and the multi-function card reader is for all kinds of flash cartoons, whether it is TF card, CF card or MemoryStick can be easily read, but the price of such products is slightly higher According to the type of flash memory card, the price ranges from 8 to 38 yuan. Kids Outdoor Slackline Set,Slackline Set,Removable Loops Slackline Set,Colourful Slackline Set SHAOXING GULI BELTING CO., LTD , http://www.gulilifting.com