A system and method are disclosed for enrolling wireless security system devices (alarms, detectors, lights) in a security system. A controller is provided and is capable of exchanging wireless signals with the devices. The system has an enroll mode where the wireless devices transmit enroll signals to the controller. The enroll signals contain an identifier associated with each device. An installer uses a keypad or other interface device to review each of the devices that have sent a signal, and to accept them for enrollment or ignore them. After review, the controller sends a signal to the devices instructing them to cease transmitting enroll signals to the controller. If the power of an enrolled device is cycled (battery replacement), another enroll command is sent to the controller. The controller determines whether the device was already enrolled, and if it has the controller sends a signal to the device to stop sending the enroll command.