Phihong's PSM03X series is part of a string of very small adapters and mobile chargers. Measuring at just 1.65 by 1.65 by 0.87 inches and weighing 3 ounces, the 2.75 W fixed wall plug adapters are available in three versions for the United States, United Kingdom, and continental Europe. The USB adapter features a constant-current/constant-voltage control that allows for a quick charge on lithium batteries and bears a 5-Star standby rating and IEEE1725 certification as a mobile phone charger. Both European versions are also halogen free meaning that they will not emit toxic smoke in the event of fire.
See the PSM03X series in white here