Pros: The ad says "no electricity required" which is an absurd statement. It does charge the device. I used it to recharge my wife's Kindel reader (the original - not a Fire). It worked. But the batteries in this unit were then dead. I'm not sure how much more power is used in charging the Kendel, but suspect that the 7 hour brag is just not true. It would be very expensive to have to replace the four AA batteries every time I charge a battery.

Cons: This unit as shipped contains the two cords, the charger case, and four AA Alkaline Batteries. You put in the batteries and there you have it. I got one charge out of it. The batteries are dead. When the batteries die, you must replace them with new batteries and the more you use it the more it costs. You can also buy four rechargeable batteries and a charger. But why do this rather than buy a recharger with a self-recharge feature. It would be cheaper in the long run.

Other Thoughts: Hmmmm. Maybe I should have purchased some Duracell batteries?