4 work modes optional Optional-- ① 24 hours with flash and alarm mode; ② 24 hours with flash but without alarming mode; ③12 hours with flash and alarm mode; ④12hours with flash but without alarming mode. Motion Activated-- It is ideal for backyard security and walkway lighting as it turns on whenever movement is detected.The wireless motion sensor strobe light is suitable for the safety of residential house, farm, villas, hotels, markets, boarding house and other places where requiring security alarm. Usage Widely-- Solar Strobe Light widely used for Farm/Barn/Garage/Yard/Villa etc outdoor and indoor series locations. Solar Alarm's one solar charging 6-8 hours, keep working around 30 days. Audible & Visible from Far Away-- The siren horn sound is 129db, can be heard from 1000m away, and the flash strobe lighting can be seen from 1000m.This light simulates the anti-theft alarm light, and can discourage break-ins during night time.Keeps an intruder away, protects your family and