Eiki Multimedia Projector LC-X1UA - Manual (Page 21)

OPERATION OF REMOTE CONTROL (Wireless)
This remote control unit can be used not only as a remote
control for the projector operation but also as a wireless mouse
for PC. The remote control unit has a pointing pad and two
click buttons. The wireless mouse function is activated when
you do not adjust the setting by using the MENU operation.
NOTE: To use the wireless mouse function, connect the
attached cable between the projector and your PC
since the mouse control signal is transferred
through the projector. Use the proper cable and
follow the instruction as described in section
“CONNECTING THE PROJECTOR” on pages 9 —
14 depending on your PC.