describe Reliable Motion Detection: Alarm system based on complete independent motion sensor, PIR motion detector has 120 detection and 180 flip design, communication range up to 328ft/100m (sound range in open places) and infrared sensor detection range about 16- 26ft/5-8m, 125dB siren or loud bell mode and state-of-the-art passive infrared (PIR) to detect any movement within the detection area, keeping you informed and safe Easy to install install it in the right place: on the wall or vertically on the ceiling. Mounting the motion alarm is easy with tape and a 360-degree rotatable wall mount. No monthly fee, no contract, no wifi network required. Hassle-free setup powered by 3 AAA batteries (not included) or USB cable. The -powered wireless design really reduces the hassle when installing motion sensors. The 360-degree rotatable bracket has a wider detection angle, which is very suitable for multiple scenarios such as home, office, and warehouse. (Note: install outdoors as the sensor is not waterproof.) -Second Arm/Disarm slide a button on the remote to arm or disarm the sensor when needed. EXPANDABLE A1 PIR motion sensor can be expanded into more home alarm system accessories. expand the system with up to 50 additional sensors or more than 20 receivers. Category: Home Alarm System