For products before Zerena: the likes of Juna, Safira, Nevara mini RITEs
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If you do not know what size of receiver you need
have a look near the tip of your old tubes – there should be a number usually Red on the right and Blue on the left.
alternately email us (firstname.lastname@example.org) having taken the measurement from the top of your ear (where spectacles would sit) straight down to the centre of the ear canal entrance in mm – please see picture below.
Replace your receiver tubes ONCE A YEAR for optimal performance