Quick Answer: A CROS hearing aid is a two-piece system for single-sided deafness: a microphone on your unaidable ear wirelessly sends sound across your head to a receiver on your good ear, so you stop missing whoever is sitting on your deaf side. Choose CROS if your better ear hears normally and BiCROS if it also needs amplification. Every CROS device is prescription-only — there is no over-the-counter CROS, and the cheap “CROS” listings on marketplaces are ordinary sound amplifiers. Budget roughly $2,500–$5,000 per fitted pair at an audiology clinic per EarPros’ 2026 pricing overview, or about $1,699.99 at Costco for the Jabra Enhance Pro 30’s CROS/BiCROS configuration, which HearingTracker lists as the cheapest legitimate route in 2026. The leading platforms are the Phonak CROS Infinio R (rechargeable, >16 hours, ERA chip) and the Signia CROS IX family.
If you have one ear that hearing aids cannot help, almost everything written about hearing aids is aimed at someone else. Amplifying a dead ear does nothing — there is no working cochlea to amplify into. What you actually need is a device that moves sound from the side you can’t use to the side you can. That device is a CROS, and it is one of the few corners of the hearing market where the old prescription model still has no consumer replacement.
CROS hearing aids by the numbers
- $2,500–$5,000 per pair: the typical fitted price for a CROS or BiCROS system from an audiology clinic in 2026, according to EarPros’ CROS pricing overview, with premium Phonak, Signia and Widex platforms at the top of that range.
- $1,699.99 per pair: the price of the Jabra Enhance Pro 30 at Costco, which HearingTracker’s 2026 Costco review reports has added a CROS/BiCROS option for people with hearing in only one ear — the cheapest fitted route we can document this year.
- More than 16 hours per charge: the rated runtime of the rechargeable Phonak CROS Infinio R transmitter, per Phonak’s own product specifications, alongside its ERA chip claim of 4× more wireless transmission power across 2× the distance of the previous generation.
- ~$1,244 for the transmitter alone: representative online-retailer pricing for a Phonak Infinio CROS/BiCROS unit, which is meaningfully less than the hearing aid it pairs with — CROS transmitters are usually the cheaper half of the system.
- 28.8 million U.S. adults could benefit from hearing aids, per the NIDCD — single-sided deafness is a small slice of that, which is exactly why the category is under-served and poorly explained online.
- Zero OTC CROS devices exist. The FDA’s 2022 OTC rule created a category for self-fitting air-conduction devices for perceived mild-to-moderate loss; single-sided deafness sits outside it by definition.
How a CROS actually works
You wear two devices, but only one of them is a hearing aid.
- The transmitter sits on your unaidable ear. It is a microphone and a radio — nothing is played into that ear.
- The receiver sits on your good ear. It picks up the wireless stream and plays it into the ear that works.
The problem this solves is the head shadow. Your skull physically blocks and attenuates sound coming from your deaf side, especially the high frequencies that carry consonants. In a car, at a dinner table, in a meeting, the person on your bad side simply disappears. A CROS hands that voice to your working ear.
What it does not do is restore stereo hearing. Localisation — knowing which direction a sound came from — requires two functioning ears comparing timing and level. One ear receiving everything cannot do that arithmetic. Any salesperson who tells you a CROS will let you tell where a siren is coming from is overselling it.
| CROS | BiCROS | |
|---|---|---|
| Your bad ear | Unaidable / no useful hearing | Unaidable / no useful hearing |
| Your good ear | Normal or near-normal hearing | Also has hearing loss |
| What the receiver does | Plays routed sound only | Plays routed sound and amplifies for that ear |
| Feels like | Nothing changes except you stop missing people | A hearing aid that also covers your dead side |
| Who decides | Your audiogram — this is not a preference | |
The main CROS platforms in 2026
These are prescription devices fitted by an audiologist. They are listed so you know what to ask for by name — pricing below is what you should expect to be quoted, not a checkout price.
| System | Styles | Power / charging | Notes |
|---|---|---|---|
| Phonak CROS Infinio R | Receiver-in-canal, 4 colours | Rechargeable, >16 h | ERA chip; 4× wireless power, 2× range; pairs with Audéo Infinio aids; hands-free calls |
| Signia CROS IX | Pure Charge&Go, Styletto, Active, Silk Charge&Go | All rechargeable; Styletto & Silk add wireless charging | Boosted dynamic range, skewed directionality; widest style choice incl. instant-fit Silk |
| Jabra Enhance Pro 30 (Costco) | Receiver-in-canal | Rechargeable | $1,699.99/pair; CROS/BiCROS option per HearingTracker; bundled fitting and follow-ups |
| Oticon / Widex CROS | Behind-the-ear and RIC | Rechargeable or 312 battery | Fitted through clinics; choose if you already wear that brand on your good ear |
How to choose between them: if you already wear a hearing aid on your good ear, the CROS transmitter must come from that same manufacturer’s family — you are choosing a platform, not a standalone gadget. If you wear nothing yet, the practical decision is clinic-versus-Costco. The clinic route buys you audiologist expertise on a genuinely tricky fitting; the Costco route saves roughly $1,000–$3,000 and bundles the fitting and unlimited follow-ups into the price. Note that CROS coverage at Costco is not uniform — some 2026 guides still state Costco offers no CROS at all — so call your local Costco Hearing Aid Center and ask for the Jabra Enhance Pro 30 CROS configuration by name before you drive there.
What you can buy online — and what it really is
Search “CROS hearing aids” on a marketplace and you will get results. None of them are CROS devices.
A true CROS requires two paired units with a licensed wireless link, programmed to your audiogram. What is actually on the shelf at $30–$90 is a personal sound amplifier: one or two independent amplifying earpieces with no cross-routing whatsoever. Put one in your deaf ear and it amplifies sound into an ear that cannot process it. That is not a cheaper version of a CROS; it is a different product that does nothing for your condition.
There are, however, three legitimate things you can buy online that genuinely help people with one usable ear.
1. Bone conduction headphones for one-sided listening
Shokz OpenRun Pro 2
- Vibrates audio through the skull and leaves both ear canals open, so your one good ear keeps hearing the room while you take a call or watch TV.
- Genuinely useful for single-sided deafness as a media device — but it does not route ambient room sound from your deaf side, so it is not a CROS substitute.
- Shokz states in its own help centre that its headphones are not medical-grade hearing aids.
Because you will want spare bands, a second charging cable, or a set of remote-mic accessories on hand while you wait for a clinic appointment, fast shipping is worth having — try Amazon Prime free for 30 days to get your hearing devices and accessories in two days.
2. A remote microphone
The single highest-value accessory for one-sided hearing costs a fraction of a CROS. Clip a wireless mic to the person you need to hear — a spouse in a car, a lecturer, a colleague across a table — and their voice streams straight to your working ear or to your phone, cutting through room noise in a way no microphone on your head can match. Manufacturer remote mics (Phonak Roger, Signia StreamLine Mic) pair with the aid you already own; generic Bluetooth lapel mics work with phone-based listening. Browse remote microphones for hearing aids on Amazon to see the range.
3. A TV streamer
Television is where single-sided deafness is most frustrating and most fixable, because the source is a wire, not a room. A dedicated TV streamer sends the audio directly into your good ear at your own volume without deafening everyone else. Our best hearing aids for TV guide covers the streaming-capable models, and TV Ears reviews the standalone headset route that needs no hearing aid at all.
CROS vs. bone conduction vs. a cochlear implant
Single-sided deafness has three real treatment paths, and they are usually tried in this order.
| CROS / BiCROS | Bone-anchored (Baha / Osia) | Cochlear implant | |
|---|---|---|---|
| Surgery | None | Yes (softband trial first) | Yes |
| Restores hearing in the dead ear | No — routes to the good ear | No — routes through bone to the good cochlea | Yes, if the auditory nerve is intact |
| Restores directional hearing | No | No | Partially |
| Typical cost | ~$1,700–$5,000 | ~$11,500–$31,500 uninsured | Highest; usually insured |
| Insurance | Rarely covered | Often covered as a surgical prosthetic | Usually covered |
| Reversible | Completely | No | No |
The reason clinicians reach for CROS first is not that it is the best-performing option — it is that it is the only one you can undo. A trial period tells you within weeks whether routing sound to your good ear helps you or just adds noise. If it helps and you want more, the surgical routes are still open. Our bone conduction hearing aids guide covers the implanted side in detail, including why insurance treats it so differently.
Living with a CROS: what to expect in the first month
- Noise from your dead side is now in your good ear. In a quiet room this is pure gain. In a loud restaurant it can be a net loss, which is why every modern CROS lets you mute the transmitter from an app. Use it.
- Your own voice may sound different for the first week or two while your brain recalibrates to receiving both sides through one path.
- Battery discipline doubles. You now charge two devices, and a flat transmitter silently gives you back your old deaf side. Rechargeable models with a case, like the Phonak CROS Infinio R at >16 hours, take most of that risk away.
- Ask about the trial period in writing. Fitting a CROS well is harder than fitting a standard aid, and the fit that works is usually the third one, not the first.
A quick health note
Hearing loss in only one ear is a medical red flag, not just a shopping problem. See a hearing professional promptly if you have sudden or rapidly worsening hearing loss, hearing loss in only one ear, ear pain, drainage from the ear, or tinnitus that pulses or is one-sided. Sudden single-sided loss in particular is treated as an emergency — steroid treatment is far more effective in the first days than the first months, and some causes are entirely treatable. No device on this page should be used to postpone that appointment. Over-the-counter hearing aids are intended for adults 18 and over with perceived mild-to-moderate loss in both ears, which is a different situation from the one this guide describes.
Related guides
For more, see our bone conduction hearing aids guide, best hearing aids, best hearing aids for severe hearing loss, Costco hearing aids, best hearing aids for TV, and OTC vs prescription hearing aids.
The bottom line
If one ear is unaidable, a CROS is the only mainstream device that addresses it without surgery — and you cannot buy one over the counter at any price. Get an audiogram, find out whether you need CROS or BiCROS, then choose your route: an audiology clinic for the Phonak CROS Infinio R or the Signia CROS IX family at roughly $2,500–$5,000 fitted, or Costco’s Jabra Enhance Pro 30 CROS/BiCROS configuration at $1,699.99 per pair if your local centre stocks it. Insist on a documented trial period, because CROS is a device you either love in the first month or return. While you sort out that appointment, the accessories that genuinely help one-sided listening — a remote microphone, a TV streamer, an open-ear headset — are the parts you can actually shop on Amazon today.