When sourcing custom IR remote controls, you must prioritize protocol compatibility (such as NEC, RC5, or Sony formats) to ensure the device communicates correctly with your target hardware. Key hardware specs include the operating voltage (typically 3V via AAA or CR2032 batteries), the effective transmission distance (standard is ≥8 meters), and the infrared wavelength (usually 940nm). For the physical build, specify the button material (silicone vs. plastic) and the printing method (silk screen vs. laser carving) to ensure durability under frequent use.