AQUA Luna is a digital passive infrared detector provided with a dual element PIR sensor and digital motion detection algorithm. Owing to the two-track analysis of the signal from the PIR sensor (valuable and quantitative) and the function of temperature compensation, the device is characterized by reliable operation in a wide ambient temperature range, high sensitivity and high interference immunity. Interchangeable Fresnel lens and three-step sensitivity control make it possible to adjust the device performance to requirements of the user and the protected premises.