This is a splittable 40 pin dual female jumper wire, it is super flexible, can be transformed from 1-40 pin jumper wire. With some of these, you will no need to worry about the jumper wires you got before do not fit your project, just split it and go.
MF RC522 is a highly integrated transmission module for contactless communication at 13.56 MHz. This transmission module utilises an outstanding modulation and demodulation concept completely integrated for different kinds of contactless communication methods and protocols at 13.56 MHz.
The very popular 595 shift register chip of the 74 series is used a lot by hobbyis because of its wide availability, good speed and simplicity. Just plug it on an arduino like shown in the tutorials and youi have 8 more outputs, put two and you have 16 more outputs ! (up to a lot of them actually, with only three pins !)
The module is used for charging of single lithium battery or multiple lithium batteries in parallel, and the charging port can take power from the USB port. output USB micro usb input / usb output / and charging lipo