The HA-434RTL Wireless long Range Household Alert & Alarm Motion Kit can indoors or outdoors to alerting you of security breaches. You can the system to one of three operating modes to be alerted of movement. All three modes will an LED to notify you of movement, you can change the mode based on the component indicator you would like to receive. Alert Mode omits beeps when a sensor is activated, Alarm Mode will off intruders with a 95 dB siren, and Off Mode will not omit any component indictation, just exteroception LED lights. A Supervised Sensor is to monitor the sensor batteries to let you know when the battery life is getting forward. expansible system, up to 16 sensors -LRB- sold separately -RRB- in up to 4 unlike zones for more enhanced security and alerting applications. This kit is with the following Skylink sensors : Wireless motion sensor HA-434TL, Garage door sensor, GM-434TL, Water alerting sensor WA-434TL and the Door/Window alerting sensor WD-434TL.