Electronics, I got this camera for a test. Like all devices proposed by FR-Sunvalley is presented in a nice box, functional and can be used for storage. It comes with a multilingual manual photo whose French translation could be better. A power cable and OTG cable I tested this with 3 appreil Android devices (sony - samsung - acer) and an external battery. As for OTG function, it can connect compatible USB devices to a tablet or smartphone. This feature is supported in principle by tablets, smartphones that run Android 3.1 or higher and ipad or iphone (not tested). But that very well Android 2.3 I have no problems connected 2 usb keys and a wireless mouse. Amusing a pointer on a smartphone screen. With an SD card reader, it was rejected by my mobile to excessive consumption. We must therefore ensure that your devices are compatible OTG. In reality it is the 15 cm cable (a bit small) that is OTG. With a female-female adapter USB, it also works, the case therefore serves only the connection and it is not necessary to take it anywhere. This small cable unfortunately not can charge. The mini USB connector is compatible with Samsung and SONY. With another brand or an iphone you will need can be an OTG-compatible cable for your device. In some cases the charging cable supplied with your device is suitable. This was not the case with my old ACER. As for the charger function, it frees up electrical outlets, which is convenient. There are two outputs 2.4 A SMART provided in principle for tablets (battery 2000m / AH) and two outputs 1,5 A PDA (Battery 1000 mA / H) Connected to a SMART output my external battery 3000 mA / H was charged in 2 hours. As for batteries, manufacturers usually provide a suitable charger to charge your device in an hour or a little more. For example for a 850 mA battery 1000mA / H. Under these conditions, the lifetime of a lithium-ion battery is 1,000 loads. But this time may be reduced when charged too quickly. If you're in no rush, so you'd better plug your tablet on IPHONE and ANDROID marked exits. It will take 3 hours to fully charge, but you will protect your expensive battery. If you connect a smartphone on marked exits SMART, the camera automatically adjust (Power IQ technology) output current for it to be loaded in an hour. If you are not using OTG function, you can connect a device to the rear USB socket, it loads too. Thanks to Power IQ, even with 4 devices care, it heats very little and charging time are not altered Conclusion: compared to other chargers in the same price range, this is a superior technology. So I assigned it 5 stars despite the slight defects mentioned above.