This bulb is one of the best sensor bulbs available in the market in Sri Lanka. The special feature is that the installation is very easy. No power supply required. So this is one of the best sensor solar bulbs to install in your outdoor area. The solar panel on top charges the battery in the bulb when the sun shines. That way it gets the required power for night time. This solar bulb is one of the best bulbs available in Sri Lanka at the lowest price. It can be used for a long time because it is made waterproof even in rainy season. Another category includes a sensitive alarm and this does not include a sensitive security alarm. This is a motion sensor bulb so when a person comes near the bulb it will turn on and automatically turn off after a while.