BoostCube 4-port USB Wall Charger from iClever has now emerged as one of the most compact and powerful chargers in Amazon.com, thanks to its compact design and powerful charging property. The technology incorporates the latest smartID technology. This allows each port to identify the appropriate charging power for your device, which means you can charge any of your devices at their maximum/ideal charging speed. Its safety and performance are effectively enhanced thanks to its highly fire-proof material and a full array of internal protection mechanisms. With dimensions of 2.44inches x 2.44inches x 1.12 inches along with a foldable plug, the charger is capable of pumping out 40W watts of power to charge any four USB digital devices at up to 2.4 amps per port. iClever BoostCube 4-Port USB Wall Charger Receives High Rating From Amazon Shoppers as a Compact & Powerful Charger.