Long-lasting battery life: This iPad stylus pencil with a length about 173mm and a weight of 16.8g has a built-in battery to provide 8-10 hours of use, and using Micro USB can fully charge your pen within 60-90 minutes (charging input 5V),At the same time the rechargeable pen has intelligent power saving function, the pen automatically turns off the power every 30 minutes to protect battery life.