In case of emergency, you will soon realize that two things you’ll definitely need is a source of light and a way to communicate to others (or to the outside world, if you’re trapped or stuck somewhere.) In short, you’ll need a torch and a phone with a charged-up battery. The WakaWaka Solar Charger is both of that, minus the actual phone, as it is actually a solar-powered device charger and flashlight in one.
The WakaWaka is primarily a charger, and it’s a pretty flexible one at that. You can position the device where the sunlight hits the solar panel in full and leave it there for 8 hours to achieve a full charge. If you can’t wait that long, then you can also just plug it in to your computer’s USB port or charge your device via AC–but then, where’s the fun in that?