The charger in this package is quite versatile with USB, connector for the 12V socket in your car and just for the standard wall outlet. These flat, there are the two batteries that are identical in dimensions with the batteries from GoPro. They fit really well in the GoPro, wiggle and do not slip.
Unfortunately, you realize both during operation and during storage, the batteries are not the best. They will self-discharge much faster than the GoPro. A deficiency, yes. But a lack, one can cope with the price; Those who expect the best quality, unfortunately, have to buy expensive the manufacturer.
The same applies to the charger. It is an all-purpose charger Bundle Star, which is sold by other dealers in the same form only with another logo. The material quality is moderate, the design "grauselig" and the quality average. But also here the following applies: who looks better, has to pay more.
For the price I can forgive good conscience four out of five stars. The batteries will discharge unfortunately too fast itself. All other criticisms are understandable and to be accepted at the price. With GoPro itself alone a battery will cost around 25 EUR. As a backup, the battery enough yet, the charger will help go very.