When I heard of this product, I thought there are three USB ports, but actually there are only two USB ports and one attached Micro USB cable. The description actually meant you can charge three devices at one go because it is able to output a maximum of 5A.
I tested it by charging two iPhones 5s and one Nexus 5 and it works fine. Charging one iPad Air, one iPhone 5s and one Nexus 5 also works well.
It has built-in SmartIC technology which detects the type of device plugged in through USB PIN signals. It then decide on the power requirement needed by the device. This will reduce power wastage and improving charging efficiency.
Unlike a conventional multi-port charger, the Bolse usb car charger features a built-in SmartIC chip, which governs the distribution of power between all the three ports. This enables one to charge multiple devices without worrying about overloading the charger or any device. Moreover, depending on the charge percentage on each device, the charger accordingly allocates power to each. This helps in quickly charging a low power device while siphoning charge away from those already near full charge.
The product is mainly made up of plastic (even the shiny area around the USB port), measures 62mm x 46mm x 21mm and weighs 43g. The specifications mentioned that the length of the coiled cable when fully stretched is about 180cm, but I highly doubt it. I will give it at most 150cm which nevertheless is still enough to be used in the car.