How do I know if my G Pro needs to be charged?

When the G Pro needs to be charged, the power button will flash 4 times indicating the device is out of power.

The power button will show a red LED light when it flashes 4 times. 

If you have any further inquiries, please contact our Customer Service Department anytime Monday through Friday, 8:00am to 5:00pm PST.
Email: help@grencoscience.com
Phone: (800) 948-7480