Set and connect the Alert Sensor and Receiver in minutes. Installation is hassle-free as there's no messy wiring to content with. Its battery-power all the way, baby, as the Receiver Unit uses 3 x AA batteries (not included) and the Alert Sensor uses 3 x AAA batteries (also not included).A completely freestanding unit, that can be placed anywhere around your home or business. The systems strong wireless signal has a range up to 200 ft./60 m from the Alert Sensor to the Receiver Unit (not included).Place the Alert Sensor in areas needing protection or vulnerable to unwanted intrusion, such as driveways, the front or back doorway, retail store entrances, reception areas, storerooms and more. Alternatively, use the system as an aid to good customer service, notifying you when customers enter and leave your business at any hour. The PIR Sensor can pick up motion up to 40ft / 12m away. Never be left with flat batteries in your Alert Sensor. The system has an indicator light to notify you when your battery power is running low. When the status LED light starts blinking continuously at you its time to change the batteries. Expand your security by purchasing more Swann Alert Sensors and pair with any compatible Swann receiver unit (not included) to monitor multiple critical areas at once such as entrances, driveways, doorways, hallways, garages, etc.