The GPR-B1000 is equipped with dual wireless and solar charging systems to support activities in the outdoors. GPS navigation is usable for approximately 33 hours on a wireless charge of about five hours. If the battery becomes depleted, GPS functions can be resumed by charging the watch in bright light. (GPS functions are usable for one hour on a solar charge of approximately four hours in 50,000 lux conditions.) Regardless of the status of GPS functions, solar charging keeps the time display powered at all times.