ANNEX IU.K.ESSENTIAL REQUIREMENTS
II.REQUIREMENTS REGARDING DESIGN AND CONSTRUCTIONU.K.
12.Requirements for medical devices connected to or equipped with an energy sourceU.K.
12.9.The function of the controls and indicators must be clearly specified on the devices.U.K.
Where a device bears instructions required for its operation or indicates operating or adjustment parameters by means of a visual system, such information must be understandable to the user and, as appropriate, the patient.