To use this Acebil RM - C2 remote control unit, first connect it properly to your Canon EOS C - series or ME - 20F - SH/ME200F - SH camera. You can then easily adjust the lens zoom, focus, and iris using the unit's controls. When using it, make sure the connection is stable to avoid any control issues. For maintenance, keep it in a dry and clean place, and avoid exposing it to extreme temperatures or moisture. If you encounter any problems, check the connection first and then refer to the product manual.