This keyboard has a built-in 1600mAh battery, which can be used for up to 75 hours after being fully charged. Its solar energy transmission rate is between 7% and 8%, and its supported illumination range is from 100 to 20,000lux. Generally, indoor lighting is about 500lux. Under such lighting conditions, the first solar charge takes 4 to 6 hours. With this design, you don’t have to wo... https://islists.com/