1. Please charge it under STRONG sunlight; do not charge it in cloudy day or the place through glass(e.g a window or car)
2. Solar charging is designed for emergencies; not a primary source of charging due to the compact solar panel size and sunlight intensity; it could take 21 hours under direst strong light to fully charge(there are 7-8 hours of sunlight per day). So we highly recommend charge the solar charger via an adapter or computer; which only take a few hours
3.Normally; it can reach 25% battery after 5 hours recharge under strong sunlight; so only the first light will on
4. The water drops are good; but please don't immerse in the water for too long.