Experience the reliability and precision of Altronix with the RBSN-TTL Relay Module. Designed for uncompromising performance, this ultra-sensitive unit is a testament to Altronix's commitment to excellence in security and automation solutions. The model RBSN-TTL is engineered to provide seamless integration and enhanced operational efficiency for a wide range of applications. Each purchase includes a single unit, ensuring that you receive the focused attention and quality that your system deserves. With the ease of installation and the renown Altronix brand behind it, this relay module is an essential component for anyone seeking a robust and secure solution.