Monitor motion in multiple areas around your home using a single receiver by connecting additional Skylink Long Range Household Alert Motion Sensors. Designed for larger homes the sensor s long range functionality allows it to signal the receiver (sold separately) from long distances (downstairs garage sensor to upstairs bedroom receiver for example). Once motion is detected by the sensor the receiver alerts you by flashing and either beeping or sounding the alarm. Note: Requires the Skylink Household Alert Long Range Receiver HA-434RL (sold separately). Contents: Motion sensor Ball-head joint Installation screws. FEATURES: Easy to set up. Use indoors or outdoors. Detection range up to 40 feet. Sensitivity options: High Low. Supervised: automatically monitors the sensor and its battery condition.