This digital speech aid can be used by those who have lost their voices due to injury, illness or surgical removal of the larynx, the opportunity to make themselves quickly understood again. It can also be used by those who have temporary speech loss after a tracheotomy or are attached to a respiration device. Patients who have mastered the oesophageal voice can use the Servox in various situations, such as on the phone, during business conferences, if tired, ill or in emergency situations and environments where it is necessary to raise their voice.