Since there isn't a widely distributed commercial component specifically labeled "HW416B" in major component databases (it is likely a house-marked version of a generic PIR module, similar to the or SR602 , or a typo for the HW-416 relay module), this review focuses on the most probable candidate: generic compact PIR sensor modules often found under similar part numbers on Amazon, AliExpress, and electronics kits. Maharani Vegamovies New