The Electric Acoustic Stimulation (EAS) Auditory Implant System combines cochlear implant technology with sound amplification technology. the first successful surgery in the world was performed in 2004 and can also be used in children. It can provide significant speech recognition in noisy environments. The Acousto-Electrical Combined Stimulation (EAS)™ Hearing Implant System is the world’s first hearing implant solution designed specifically for patients with partial deafness. Partial deafness is defined as mild to moderate low-frequency sensorineural deafness, while hearing in the high frequencies is characterized by profound deafness. A two-part solution is used: First, the cochlear implant has non-invasive and flexible electrodes that can be electrically stimulated to process the high frequencies and stimulate the associated nerve cells. Second, sound amplification is used to stimulate the nerve cells responsible for processing low-frequency sounds. The combined acoustic and electrical stimulation makes full use of natural residual hearing to provide the user with a superior hearing experience. The cochlear implant component converts everyday sounds into encoded electrical impulses. These electrical impulses stimulate the auditory nerve. The brain translates these signals into sound. The microphone of the DUET2 speech processor receives medium and high frequency sounds and converts them into a specific code. This code is transmitted to a coil and through the skin to the implant. The implant first translates the code and then sends electrical impulses to electrodes in the cochlea. The auditory nerve relays these signals to the brain. Acoustic amplification mostly amplifies the sounds that can be perceived by the cochlea. For the EAS, only low-frequency sounds are amplified. The microphone receives the low-frequency sounds and processes them digitally. A speaker in the earhook amplifies the sound and subsequently transmits it through the ear mold to the external ear canal. The sound reaches the undamaged area of the cochlea, which is responsible for processing low-frequency sounds. The auditory nerve sends the signal to the brain.