Looks quite chic and the advertising is indeed quite full-bodied (up to 30 hr. Portable Energy). As always with "up to" a little caution is advised and a glance at the technical data is worth. Here you will find little information on Amazon as well as other retailers. Directly at Philips there is a data sheet. Since the matter reads a bit more sober: Voltage 5.6V - enough for almost all mobile phones, etc. (USB standard). Current output max. 350mA = 0.35A - which is already quite meager. For mobile Suffice it, but a BlackBerry or Garmin Nuvi already approved 0.5 - 0.8A to charge the battery when it is switched. Capacity 900mAh - Although this is quite nice for a phone, but a GPS Nüvi is thus being charged me a break. Here at Amazon there are small light auxiliary battery in the "under 20 class", who also this voltage / current output / capacity and are (theoretically) be charged by sunlight. In theory only because they are around 2-3 days must dazulegen in direct sunlight. But the only way.
Conclusion: For real small consumers (mobile) there much cheaper devices; for devices with more power just look at the technical data!
