This x5r has a e-switch (momentary tact) side button and a micro usb port in the head. To use this host properly requires a pcb to hold the switch and usb port in the right location. This pcb needs to be the right diameter and shape. So, in order for anyone to use this x5r host they would either need the pcb or need the exact measurements (including exact position of button and usb port) to create their own pcb.
A similar pcb is used in the x6r. Image from post 79
The blue pcb.