4 WAY SMART USB Allows charging of up to 4 devices simultaneously such as smart phones, tablets, mp3 players, cameras & sat nav. Smart Universal Fast Charging Technology enables the USB Charger to detect the mobile device and charge it at an optimal rate. Integrated Smart-Fuse protects your vehicle and device against: Short Circuit protection Over temperature protection Over load protection Over current protection Over input voltage protection Reverse polarity protection Product Dimensions (mm): H 32 x W 37 x D 71 Weight (kg): 0.03 Voltage: 5V Watts: 34W Amps Output: 6.8A Reverse polarity protection Specification Sheets Product Dimensions (mm): H 39 x W 36 x D 73 Weight (kg): 0.028 Voltage: 5V Watts: 34W Amps Output: 6.8A