Solar Universe India Plastic Motion Sensor Security Light With Siren, Inbuilt Battery & Solar Panel  (Black, 2-watt) This is a motion sensor based solar wall & exterior lamp. It comes with an inbuilt battery of 27Wh and an external solar panel of 3W. Once the lamp is switched on, it works on motion sensor wherein once it detects human movement - the super bright 36 LEDs will light up and hence this product may be used as a security lamp for your front lawn, gardens and farm houses. It also comes with an electricity charger which makes it hybrid and useful during rainy season. Once the product detects movement and lights up, it stays on for 30 seconds or more. In one full charge, the lamp can work for upto 8 hours.