The Paradox PDX-SP65 offers a combination of innovative features and an advanced communication bus for a unique expandable security system. Through its communication bus, The PDX-SP65 can be expanded via wireless and hardwired expansion modules and a variety of accessory modules. With its reliable communication technology, flexible expansion, and great-looking keypads, the PDX-SP65 is an ideal security system for any residential or commercial installations that require up to 32 zones of protection.