Hunt-for-Sun is a software program. The Solar-Breeze will wake itself up and run for two minutes. While it is running, it will check to see if there is enough sun available to recharge itself. If there isn't, it will go into sleep mode for eight minutes and then try again. When it registers that there is sufficient sun to recharge, it will stop in place until it is fully charged. Recharging may take up to an hour.