
Ideal for charging in an emergency. It plugs into a USB-C port and adapts to the Surface Pro charger. I have 3 Surface Pro 3s that I can't find chargers for and this little device gave them LIFE! It doesn't have an outside light, so you'll have to open it quickly to make sure it's charging. The charging speed depends on the type of plug and cable used. It's durable and will hold up to everyday use for the 3 weeks I've been using. It was a lot cheaper than buying the original Surface Pro charger. I will buy again.