Phonak receivers come in various sizes and power levels to accommodate different levels of hearing loss and ear shapes. Here’s a breakdown of the different types:S – Standard Receivers: These are the least powerful and are used for mild to moderate hearing losses. They are available in sizes 0, 1, 2, and 3.M – Medium Receivers: These provide a middle power level and are used for moderate to moderately severe hearing losses. They are available in sizes 0, 1, 2, and 3.P – Power Receivers: These are the most powerful and are used for moderately severe to severe hearing losses. They are available in sizes 0, 1, 2, and 3.It’s essential to consult with your audiologist to determine the correct receiver size and power level for your specific needs.