... Specification : Sense TypePassive infrared sensor & Light senseAjustable wayON/OFF, LED brightness,Delay time, Operation brightnessSensing angle90 degree (adjustable)sensing distance5meters ... bright for the ambient light,only it is working under 20luxC.voltage is low,need to change battery.Usage ... -gate,wall and ceiling wall even any places in car. 8.fixed in walkway,corridor,stairs,basement.no need ...