Case with a versatile high frequency power device. Many special accessories that can be used for various purposes. Seems to be missing a small part of the lid. Via this device a varying charge is applied via the holder, herein the various glass tubes can be inserted, which are filled with ozone. By holding this against the skin, an alternating voltage between the gas and the skin is created. This is accompanied by a visible spark in the tubes and gives a crackling sound and a stinging feeling. (sometimes even painfull) The most healing properties that are attributed to the unit are in the field of rheumatology, orthopedics, wound care and acupuncture Was also used for the treatment of hair loss and the treatment of warts and even for mental disorders. The company Tefra still exists and is still involved with high frequency therapy. Not all accessories have been tested, functioning at your own risk.