The pins of the built-in plug and plug adapter do not have an insulating collar. The plug adapter allows single-pole insertion of a plug, leaving the remaining free live pin accessible. The cover for the LED can be removed by hand during charging, leaving live parts accessible. The cross-sectional area of the core of the wires is insufficient: in case of a short circuit the wires may overheat and can cause a fire. The heat and flame resistance of the insulating material that hold the pins of the built-in plug in position is insufficient.