A Li-Ion charger is a device used to safely charge lithium-ion batteries, which are commonly found in phones, power banks, drones, tools, and DIY electronics.

The Flysky FS-i6X is a popular 6-channel 2.4GHz radio control transmitter and receiver system, widely used in RC planes, helicopters, drones, and cars. It's known for being affordable, reliable, and beginner-friendly, while offering decent flexibility for hobbyists.

USB Type-B is a square-shaped USB connector commonly used for connecting printers, scanners, and some older external hard drives to a computer.

A photo-electric switch (also known as a photoelectric sensor or photo sensor) is an electronic device used to detect the presence or absence of an object, or to measure the distance to it, by using a beam of light.

high voltage version(3-30V) 

Cell holder for 1x 18650 battery