John W.
This works great on long days where you can't get to a charger. We use these on our bikes. It includes 2 ports. We both use mapping programs on our phone which gives us speed, miles traveled, Average speed, weather and a map. We have a phone carrier on our handle bars. If you keep the screen on, the battery drains in 3 hours. With this device, the phone is charging all day and stays at 100%. The other port, we alternate between our front and rear light. When we stop to rest or eat, we charge our back light. This is a great device to always have phone service and lights on our bike trips. We love these chargers!