It sounds like you’ve come across a reference to the PX-RC1 — likely a remote control unit for a piece of consumer electronics, possibly a camera, projector, audio device, or lighting equipment.
Power On: Manually turn on the device you want to control (TV, DVD, etc.).
Appendix
The manual for the PX-RC1 is essentially a list of secrets. To make it work, the user must look inside the battery compartment to find the remote's version number, which dictates which code list applies. If the printed manual is lost, the search moves to online forums where users have been asking how to program this specific model since at least 2009. Chapter 2: The Ritual of Programming
This is the most searched issue. Do not throw the remote away. Try these steps in order. px-rc1 remote control manual
Enter Code: Use the number pad to enter the 4-digit code for your brand. If the code is accepted, the red indicator light will turn off.
Introduction to PX-RC1 Remote Control
PX-RC1 Remote Control Manual: A Comprehensive Guide