Hearing aids come in five main styles, each with a different size, placement, and set of trade-offs. The right one depends on how much hearing loss you have, how visible you want the device to be, and how comfortable you are handling small electronics. Beyond style, hearing aids also fall into two regulatory categories: over-the-counter devices for mild to moderate loss and prescription devices that cover the full spectrum from mild to profound.
Receiver-in-the-Ear (RITE or RIC)
This is by far the most popular style, accounting for roughly 63% of the hearing aid market in 2025. A small case sits behind your ear while a thin wire carries the speaker (receiver) into your ear canal, where a soft tip holds it in place. Because the tip doesn’t seal your ear canal completely, sounds tend to feel more natural, and you’re less likely to hear your own voice as boomy or hollow. That sealed-off feeling, called the occlusion effect, is one of the biggest complaints with other styles.
RITE devices work for mild to severe hearing loss and are small enough to be fairly discreet. Most current models offer Bluetooth streaming, letting you send phone calls or music directly to your ears. Many also come with rechargeable batteries that last 24 to 36 hours on a single overnight charge, including several hours of streaming. The main downside is that the receiver sits inside your ear canal, exposed to moisture and earwax, so it may need occasional replacement. You also need decent finger dexterity to handle the thin wire and soft tip during insertion.
Behind-the-Ear (BTE)
The BTE is the classic hearing aid design and the most versatile. All of the electronics sit in a curved case behind your ear, connected to a custom ear mold by tubing. Because the case is larger, it can house a bigger battery, a telecoil for looped venues, and more powerful amplification. BTE models are the go-to choice for severe to profound hearing loss, where smaller devices simply can’t deliver enough volume.
Durability is another strength. With the sensitive components housed outside the ear canal, BTE hearing aids typically last five to seven years. They’re also easier to clean and maintain. The trade-off is visibility: the ear mold and tubing are more noticeable than what you’d get with a smaller style. A custom ear mold can also create that boomy, hollow quality to your own voice, though venting the mold helps reduce it. For children, people with profound loss, or anyone who values reliability over cosmetics, the BTE remains hard to beat.
In-the-Ear (ITE)
ITE hearing aids fill either the entire bowl of your outer ear (full-shell) or just the lower half (half-shell). Everything, the microphone, amplifier, speaker, and battery, is packed into one custom-molded piece. There’s nothing behind your ear at all.
The bigger shell makes these easier to insert and remove than the tiny in-canal styles, which is why they’re often recommended for people with arthritis or limited hand dexterity. They suit moderate to severe hearing loss well and can fit a size 13 disposable battery, which lasts 10 to 14 days. The downside is that all those electronics sit inside your ear, exposed to wax and moisture, so the average lifespan drops to three to five years. They’re also more visible than canal-style devices, though less conspicuous than a BTE with a full ear mold.
In-the-Canal (ITC)
An ITC hearing aid is about half the size of a full-shell ITE. It sits in the lower portion of the outer ear and extends partway into the canal, making it less visible while still being large enough to include useful features like volume controls or a program button. It’s a middle ground for people who want something more discreet than an ITE but aren’t comfortable with the very smallest devices.
ITC models typically use size 312 batteries, which last about 7 to 10 days. Some users with sensitive ear canals find them less comfortable than a RITE style, and they’re not ideal if you also experience tinnitus, since the limited space makes it harder to include tinnitus-masking features. They work best for mild to moderately severe loss.
Completely-in-Canal (CIC) and Invisible-in-Canal (IIC)
These are the smallest hearing aids available. A CIC fits entirely inside your ear canal, and an IIC sits even deeper, closer to the eardrum, making it virtually invisible to anyone looking at you. If cosmetics are your top priority and your hearing loss is mild to moderate, these styles deliver.
The size comes with real compromises, though. They use the smallest disposable battery (size 10), which lasts only 3 to 5 days. The microphone sits deep in the canal where moisture and earwax can shorten the device’s overall lifespan. You need good vision and nimble fingers to change the battery and keep the device clean. There’s also little room for extras like directional microphones, telecoils, or Bluetooth radios. For many people, the cosmetic benefit outweighs these limitations, but it’s worth understanding what you’re giving up.
CROS and BiCROS Systems
Standard hearing aids amplify sound for the ear they sit in. CROS and BiCROS systems solve a different problem: hearing loss that’s dramatically worse on one side. A CROS system places a microphone on your worse ear and wirelessly sends that sound to a receiver on your better ear, so you don’t miss conversations happening on your “bad” side. A BiCROS setup does the same thing but also amplifies sound for the better ear, which is useful when that ear has mild to moderate loss of its own.
Bone-Anchored Hearing Systems
Some types of hearing loss can’t be treated with a conventional hearing aid at all. If your ear canal is malformed, chronically infected, or surgically altered in a way that makes an ear mold impossible, a bone-anchored hearing system bypasses the outer and middle ear entirely. A small titanium post is surgically implanted in the skull bone behind the ear, and an external sound processor clips onto it. Vibrations travel through bone directly to the inner ear.
Bone-anchored devices are also increasingly used for single-sided deafness. When one ear has no usable hearing, the processor picks up sound on that side and sends it through the skull to the functioning inner ear on the opposite side, effectively eliminating the “head shadow” that makes it hard to hear someone standing on your deaf side. These are always prescription devices and require a minor surgical procedure.
Open Fit vs. Closed Fit
Regardless of style, most hearing aids can be configured with either an open or closed fit, and this choice has a big effect on sound quality. An open fit uses a dome or tip that leaves your ear canal partially unsealed, letting low-frequency sounds pass through naturally. This dramatically reduces the occlusion effect, that plugged-up sensation that makes your own voice sound too loud or echoey. Open fittings are a major reason modern hearing aids are more comfortable than older models, and they’re the default for mild to moderate high-frequency loss.
A closed fit seals the canal more completely with a custom ear mold or a closed dome. This gives the hearing aid more control over the sound reaching your eardrum, which is necessary when you need heavy amplification for moderate to profound loss. Closed fits also let directional microphones and noise-reduction features work more effectively. The trade-off is more occlusion and a less natural feel, especially when you’re talking or chewing.
OTC vs. Prescription Hearing Aids
Since 2022, the FDA has allowed over-the-counter hearing aids to be sold directly to adults 18 and older with perceived mild to moderate hearing loss. OTC devices don’t require a hearing test, audiologist visit, or prescription. You buy them, adjust the settings yourself using built-in controls or a smartphone app, and start wearing them. Many OTC models are RITE or earbud-style designs with Bluetooth connectivity.
Prescription hearing aids are everything else. They’re programmed by a licensed audiologist or hearing instrument specialist based on your specific audiogram, and they can be calibrated for any degree of hearing loss, including severe and profound. Prescription devices also include styles that OTC regulations don’t cover, like bone-anchored implants and powerful BTE models. If your hearing loss is worse than moderate, if it affects only one ear, or if you’re fitting a child, prescription is the only path.
Battery Options
Most new hearing aids are rechargeable, using lithium-ion batteries that charge overnight and deliver a full day of use, typically 24 to 36 hours including several hours of audio streaming. You drop them in a charging case before bed and pick them up in the morning. For people who found disposable battery changes frustrating, this alone can be a reason to upgrade.
Disposable zinc-air batteries are still used in many models, especially smaller custom styles. Battery life depends on the size:
- Size 10 (yellow tab): 3 to 5 days, used in CIC and IIC devices
- Size 312 (brown tab): 7 to 10 days, common in ITC and RITE models
- Size 13 (orange tab): 10 to 14 days, found in ITE and BTE devices
Features That Vary by Style
Larger hearing aids have room for more technology. A telecoil, which picks up signals from hearing loops in theaters, airports, and houses of worship, fits easily in a BTE or ITE but rarely makes it into a CIC. Directional microphones, which focus on the voice in front of you while suppressing background noise, also perform better in larger casings where two microphones can be spaced farther apart. If you spend a lot of time in noisy restaurants or meetings, this matters more than you might expect.
Bluetooth connectivity has become standard across most styles except the smallest in-canal devices. Paired with a smartphone app, it lets you stream audio, adjust volume, and switch listening programs without touching the hearing aid. For situations where even Bluetooth isn’t enough, remote microphones can be placed near a speaker or on a table to pick up conversation and send it wirelessly to your hearing aids, a feature especially useful in classrooms or conference rooms.