The 7I48000F18UCG with SMD Crystal Resonators SMD-5032_4P RoHS is an SMD (Surface Mount Device) manufactured by SJK. It is a frequency control module with an 18MHz frequency and is RoHS compliant. The module consists of a crystal resonator, SMD-5032_4P, which is a type of resonator used to provide stable, precise frequency control in electronic circuits. The module is a low-profile surface mount component, making it ideal for use in space-limited applications. It is also designed to be highly reliable and has a long-lasting durability.