The module can realize long-distance energy transmission of 152mm with a maximum output of 12V/3A and up to 95% efficiency. With 3A load, the longest transmission distance is 55mm. Note that input voltage for transmitter is 24V.
This adapter allows you to connect a barrel jack connector to bare wires. One end has screw terminals and the other has a 5.5x2.1mm, center-positive female barrel jack.
Simple plug adapter that comes in handy when you have power supply with 5.5/2.1 mm plug and device with 5.5/2.5 mm connector. Of course, you'll still have to check if both devices are center positive (most common case) or center negative (rarely, but it happens).