Biometric authentication is no longer limited to fingerprints and face unlock. Researchers are now exploring whether your earbuds can recognize you simply by listening to the tiny vibrations created by your heartbeat.
A new study published on the arXiv preprint server introduces “AccLock,” a passive authentication system that uses standard earphone hardware to verify a user’s identity. Instead of relying on microphones or voice prompts, the system works through built-in accelerometers already found in many modern earbuds.
The technology captures heartbeat-induced vibrations inside the ear canal, known as ballistocardiography (BCG) signals. These signals travel through bones and tissues, creating patterns unique to each person. That uniqueness is what makes the system interesting. Once the earbuds register a user’s BCG signal, they can continuously check whether the same person is still wearing them. If another user puts on the earbuds, the authentication fails automatically.
Unlike older earphone-based authentication systems, AccLock does not require users to actively interact with the device. The entire process runs quietly in the background, which could eventually make tasks like unlocking devices, approving payments, or entering smart homes feel almost invisible.
To improve reliability, the researchers used a deep learning model and a multi-stage denoising system to separate user-specific heartbeat patterns from environmental noise and general body movement. In tests involving 33 participants, the system achieved false acceptance and false rejection rates of 3.13% and 2.99%, respectively, which is fairly promising for an experimental prototype.
However, heavy movement remains a major problem. Walking, talking, or shaking the head significantly increased error rates, showing that the system still struggles in real-world conditions. The researchers also tested the technology on Apple AirPods and found that it remained functional despite hardware limitations. While AccLock is far from becoming a commercial feature today, it offers a glimpse of a future where your earbuds quietly recognize you before you even unlock your phone.
The OnePlus Buds Clip are a new pair of open-ear earbuds built around a simple convenience. They join Sony’s LinkBuds Clip in the growing ear-cuff category, but either OnePlus bud can go on either ear.
Sensors recognize how the earbuds are being worn and route the audio channels accordingly. There’s no label to check before putting them on, and the feature also works when only one bud is used.
We buy fitness bands and activity trackers to keep tabs on our exercise, but it is easy to forget to start tracking or switch modes when moving between different activities. For Fitbit and Pixel Watch users, that could soon become a lot less annoying, as Google is rolling out a major upgrade to automatic activity tracking that can recognize more than 100 types of exercise, up from just 10 before.
Google first showed off the improved tracking earlier this month alongside the Fitbit Edge. It is now coming to Fitbit Air and the Pixel Watch 3, 4, and 5, and Google claims the added context behind the system makes workout detection nearly twice as accurate while cutting missed activities by more than half. Fitbit Edge will support it too.