Linear offers advanced controls for creating complete security systems. The DVS-1200 and DVS-2400 are for totally wireless systems. The DUAL-824 is for wireless/hardwire hybrids. Both feature optional voice prompts and two-way voice communications. Start with these basic controllers and expand your system with whatever you need for creating a customized home security, including remotes, door/window sensors, smoke detectors, motion sensors, glass breaks, plus all the receivers and controllers that support them.