【 EFFECTIVE DISTANCE】: Working range is up to 70 meters. Infrared sensing distance is 3-7 meters.The sensor uses 3 AAA batteries (Not Included), and place the wireless motion sensor and alarm receiver wherever you prefer. 【APPLICATIONS】: It can be successfully used for your home, hotels, guest houses, offices, warehouses, office buildings, villa courtyards, etc...Also great to alert business owners that are working in the back, or out of sight, to customers entering their store. Use as a signal when pet is ready to come in or out. 【PIR TECHNOLOGY】 : Our sensor uses state-of-the-art passive-infrared (PIR) sensor to detect any movement within the detection range. Perfect for long or hidden driveways and allows you a fore warning when guests (or intruders) are approaching. 【EASY INSTALLATION】: As for this visitor chime, there are no wires to run, no installation hassles, the sensor is wall mountable.The portable wireless plug-in receiver plugs into any standard outlet.Please note that this not waterproof.Keep it away from rains or cover adequately. Easy and fast wire-free installation with infrared sensor that detects motion and sends a signal to the receiver Choose from 38 ringtones with a bright LED light for alerts Portable wireless plug-in receiver that plugs into any standard outlet Sensor operates on 3 AAA batteries (not included) with configurable detection time delay from 15 to 30 seconds Working range of up to 328 feet (100 meters) between receiver and transmitter