For safety reasons, the OneBlade is designed to only operate while cordless. This is because your OneBlade can be used for both wet and dry shaving. Using your OneBlade near water while connected to electricity can be very dangerous. To avoid any risks, the device does not work while it is connected to a power outlet.

Keep in mind that the Philips HQ87 adapter for OneBlade is splashproof. Meaning the device can be exposed to a splash of water, however the device cannot be subject to direct contact with water for an extended amount of time.  Hence, while charging your OneBlade ensure that you keep the device and its adapter away from water or any wet surfaces.