Safely power your USB devices using this Insignia™ NS-PWS528U surge protector that features 2 outlets and 2 USB ports for easy connectivity and a 500-joule rating for reliable defense. An LED indicator lets you know when your equipment is protected.
Q: Will this product work with a Samsung tablet and a external battery?
A: There are two "normal" outlets and 2 USB outlets. If your equipment has cords that work with either of those, you're good to go.
Q: Can you charge a Fitbit Flex2 with this device?
A: There are two USB ports that appear to share a 2.1 amp rated power supply circuit. I do not know what the recommended charge rating is for the Fitbit device you are asking about, but if it is significantly less than 2.1 amps (i.e. .8 ~ 1.2 amps) I would use the converter that accompanies the Fitbit rather than this device, as you may depreciate the life cycle of the battery in the Fitbit with the higher charging rate. If the Fitbit recommends up to 2 to 2.2 amps, this device will work fine for you.
A: 3" wide x 4.5" high x 1.25" deep