The Ultrasonic wavelength repels mosquitos. The function is on for 36 hours before charging is needed. Charging happens when the light is on and the battery is fully charged in 30 minutes. The wavelength reach out to 18 meter theoretically. When power is cut and wall switch is in mode “on”, the back up light starts to operate with the lumens of  250 lm, which is equivalent to a 40W incandescent bulb with frosted glass. If wall switch in in “off” mode the backup light does not operate Battery  can last for 3 hours at 250 lm. Battery is charged automatically when AC electricity is on and it is under protection of overcharging.

Comparison
I led bulb saves more than 50% of the energy compared to a fluorescent and last about 10 times longer than a fluorescent. Beside the energy saving it reduces the CO2 emission with up to 80% and does not contain harmful mercury or cancer developing naphthalene. LED light does not generate UV radiation. 

Mosquito Repellent
To buy one spray can of Deet based Doom cost $6,5 and that can is consumed in about a month or quicker. That represent a cost of 78 dollar every year. Vape and coils cost about $40 per year. Ecolux mosquito and pest repellent led backup light only cost $ 9.99 and last for 24x7x365.

Back Up
Today people are using candles, kerosene lanterns or battery charged lanterns that in Kenya cost about $35-45. These lanterns gives very weak light - generally only 110lm in relation to Ecolux Back Up that produce 300lm. That's equivalent to a 35W incandescent bulb which is the best in the market. For the price of $9.99 Ecolux offer a bulb, that beside the repellent function, offers a back up time in about 3 hours when there is power black out.