Remote Evaluation of the Naída CI M90 (Marvel) Sound Processor

Inclusion Criteria: * CI users with a CI, HiRes90K (Advantage) or HiRes Ultra cochlear implant system * Unilaterally implanted recipients using only a Naída Q sound processor * Bimodal users: additionally using hearing aid on their contralateral ear * Minimum of 18 years of age * Minimum of five years' experience with their Naída Q sound processor * Minimum of six months experience with their contralateral hearing aid (if applicable) * Ability to give feedback on sound quality * Speech intelligibility with the BKB sentence test in noise at a +10 dB SNR \> 10% as obtained during previous visits in the clinical routine or BKB \>50% in quiet conditions if noise has previously not been tested * Fluent in English language Exclusion Criteria: * Difficulties additional to hearing impairment that would interfere with the study procedures * Concurrent participation in any other clinical hearing study * Not due to have their sound processor upgraded in line with normal clinical procedures