120 CFM,1.2 Sones with LED Nite light and Photo Sensor. The Duct size is 4" The sensor senses motion. It is factory preset to go on and stay on for 3 minutes. It can be set to stay on for up t o 30 minutes. The sensor range is 90 degrees in a cone shape down to the floor. The sensor is equipped with 6 LED lights. One is an indicator light showingthe status of the sensor switch. The other fove LEDs act as a night light which must be switched seperately.