Extend AD-400 lock deployments without pulling new cable through finished spaces. The COM400L 626 wireless communication kit adds a 900 MHz communication PCB and cover with indicator lens, giving retrofit teams a cleaner path to connect compatible cylindrical lock hardware to access control infrastructure. Designed for classroom and storeroom functions, this kit supports controlled openings where credentialed access and clear status indication matter. It is a practical fit for schools, offices, and facilities that need to modernize door security while keeping installation time and wall impact under control. For teams standardizing on wireless door hardware, the value is in the details: fewer invasive changes, a purpose-built communication module, and a form factor intended to integrate with AD-400 lock assemblies. That makes it easier to upgrade doors one opening at a time while maintaining a consistent access control architecture across the site.