... design, concealed fastening.Internally installed light perception component, and can automatically identify daylight or night. STBY Standby at daylight , ... batteryDelay time: 20, 60, 90, normally on (as emergency light)Induction interval time: 5-7secondTime for Power on self test ... rain, heavy humidity, and low temp, very changeable light.Sensor light should not be set beside the window, or any ...