The SPMWHT541MP5WAUMS4 is a motion sensor from the SML Series. It is a PIR motion sensor that features a passive infrared (PIR) circuit capable of a high degree of accuracy and sensitivity. It has a detection range of up to 25 feet and an adjustable time delay of between 1 to 30 minutes. The SML Series is designed for indoor use and is suitable for commercial, residential, and institutional applications.