ESS EMM Emergency Power Failure LED Light Bulb - Safety During Power Outage - Lights Up Automatically When Power Fails - Rechargeable Battery - Works Like Ordinary Bulbs - 3500K Hurricane 9W 120V
POWER OUT, LIGHT ON! - ESS EMM Everbright LED Bulb integrates a rechargeable built-in Lithium-Ion battery, bulb will automatically activate in the event of a sudden power outage(Hurricane,Snowstorm) and will light for up to 5 hours.
ENERGY EFFICIENT:ESS EMM LED Emergency Light Bulbs uses 80% less energy than 60 Watt Incandescent Bulbs while maintaining the look and feel of a classic light bulb. And these are solid light source, free from radiation and mercury pollution hazards, can be used safely.
RECHARGEABLE : Yes it will automatically recharge when you use it normally. Recharging time: 4 -6 hours, power back up to 3-5 hours,
You can put them on the water, the light will on, and also make the bulb lighten by your finger like our pictures show.