When the double layer capacitance idea is used to create a device, they are sometimes called "ultracapacitors" because they store energy by separating the charges (like a capacitor but capable of storing more energy), instead of using a chemical reaction to store electricity. This means that the devices can work correctly for a much longer period of time and charging a device like this takes less time than charging a traditional battery. However, the solution will dry up over time, causing the device to eventually fail. Currently there are several devices that use this technology, including: wireless modems, GPS devices, CMOS computer chips, solar battery operated chips, windmills, electric cars, and power tools.