Most hearing aids have a telecoil built in, but many users never know it’s there because it hasn’t been activated. Finding out whether yours has one takes a combination of checking the device itself, reviewing your model’s specs, and possibly calling your audiologist.
Check for a T-Switch on the Device
The most obvious sign of a telecoil is a physical toggle or button marked with the letter “T” on the hearing aid’s body. This is sometimes called a t-switch. On behind-the-ear models, it’s typically a small switch or button on the bottom edge of the casing. On in-the-ear models, it may be a tiny toggle you can feel with your fingernail near the battery door. Flipping or pressing it switches the hearing aid into telecoil mode, which picks up magnetic signals from hearing loops and compatible phones instead of relying solely on the microphone.
Not all telecoil-equipped hearing aids have a visible T-switch, though. Many modern hearing aids use program buttons that cycle through listening modes, and one of those modes may be the telecoil setting. If your hearing aid has a button that cycles through programs (you might hear a beep or tone as it switches), one of those programs could be telecoil mode, even if there’s no “T” printed anywhere on the device.
Look Up Your Hearing Aid Model
If there’s no obvious switch, check the documentation that came with your hearing aids or search for your model online. The manufacturer’s website will list telecoil as a feature if it’s included. You’ll need the brand name and model number, which are usually printed on the hearing aid itself, on the case it came in, or on your audiologist’s paperwork. Nearly every major manufacturer includes telecoils in their behind-the-ear and in-the-ear models above the entry level. Very small hearing aids, especially completely-in-canal styles, often lack telecoils because there isn’t enough physical space inside the shell for the coil.
Your Telecoil Might Exist but Not Be Turned On
This is the detail that catches most people off guard. A telecoil can be physically present in your hearing aid hardware but remain completely inactive because it was never programmed during your fitting. Audiologists configure hearing aids using manufacturer software, and the telecoil program has to be deliberately set up and added to your list of available listening modes. If your audiologist didn’t do this at your initial fitting, the telecoil is essentially dormant.
The Hearing Loss Association of America recommends directly asking your audiologist: “Do my hearing instruments have telecoils? If so, please activate and program them.” This is a routine adjustment that takes just a few minutes during an office visit. Your audiologist will add telecoil mode as one of your selectable programs and adjust its volume and frequency response so it sounds right for your hearing loss.
How to Test if Your Telecoil Is Working
Once you believe your telecoil is active, testing it is straightforward. The simplest method is to hold a landline phone (not a cell phone) up to your hearing aid. If the telecoil is on and the phone is hearing aid compatible, you should hear the caller’s voice clearly through the telecoil with less background noise than you’d get through the regular microphone. Many smartphones are also telecoil-compatible, rated with a “T” score on their spec sheets, but a corded landline is the most reliable test.
A better test is to visit a location with a hearing loop system. Many theaters, houses of worship, bank counters, and airport gate areas have hearing loops installed, marked by a blue sign showing an ear with a “T.” When you switch your hearing aid to telecoil mode inside a looped space, sound from the venue’s microphone system feeds directly into your hearing aid. If you hear the speaker or performance clearly and directly, your telecoil is working.
Automatic vs. Manual Telecoils
Some hearing aids have automatic telecoils that detect a magnetic signal from a phone and switch on without you doing anything. This sounds convenient, but there’s a catch: automatic telecoils typically respond only to telephone signals, not to hearing loop systems in public venues. If you want to use hearing loops at theaters, churches, or conference rooms, you need a manually activated telecoil that you can switch on yourself. If your hearing aid only has an automatic telecoil, ask your audiologist whether a manual option can be added as a program.
What If Your Hearing Aid Doesn’t Have One
If your hearing aid doesn’t have a telecoil, your options depend on the model. Some hearing aids can’t be retrofitted because the coil hardware simply isn’t inside. In that case, you can use a separate neck loop or streamer, a small device you wear around your neck that picks up the loop signal and sends it to your hearing aids wirelessly via Bluetooth or another protocol. These work well but add an extra device to carry and charge.
When it’s time to replace your hearing aids, specifically request telecoil capability. It adds little to the cost and gives you access to thousands of looped venues worldwide. Some newer hearing aids also support Bluetooth LE Audio, a technology that may eventually offer similar public-venue streaming. But hearing loop infrastructure is already widely installed, and industry experts expect loops and telecoils to remain the primary public assistive listening technology for at least the next decade. Getting a telecoil now means you can use what’s already available today rather than waiting for a newer standard to roll out.