A:AnswerThis Portable Charger works with most USB-chargeable devices, for example cell phones, tablets, and MP3 players.
This product does not work with laptop computers.
David M. - Insignia Support
A:AnswerIphone 5s for sure...laptop it may hold its own for a while but you wont get much longevity out of the charge as the laptop voltage draw would be much larger than an Iphone. So duration would be your biggest issue
A:AnswerThis charger works with many Androids and iPhones. I gave my sister and son this charger for their iPhones, and I have one for my Android phone!
A:AnswerNeed to define constant power. Yes in the sense of it would function as designed as a portable power source. But does drain with use. 1 device in stable draw like the tracker you could probably get a substantial amount of life or of a single charge.