How Bone Conduction Works
Standard headphones send sound waves through the air and into your ear canal. Bone conduction headphones work differently: they sit against your cheekbones (or mastoid bones behind the ear, depending on the model) and vibrate. Those vibrations travel through the bone structure of your skull directly to your cochlea, bypassing the outer ear canal entirely.
The practical consequence: your ear canals remain completely open. You hear the translation through bone vibration. You hear everything happening around you through your ears in the normal way. Both audio streams coexist without interference.
This is the hardware property that makes bone conduction useful for translation in active environments. You don’t have to choose between hearing the translated speech and hearing your environment — you hear both.
Why Open Ears Matter for Translation
In-ear audio for translation requires a trade-off. If you seal your ears with earbuds or over-ear headphones to hear the translation clearly, you cut yourself off from environmental audio. On a construction site, that means missing equipment warnings. See the construction site translator guide for the full job site workflow. In a medical setting, it means possibly missing alarms or other staff. In any outdoor setting, it means reduced situational awareness.
Bone conduction resolves this. The translated audio reaches you without blocking your ears. You can hear the machine operating nearby, the other clinician calling your name, the traffic approaching from behind — while simultaneously receiving the translation. For the full construction workflow, see Puente for Construction.
This is also why bone conduction is required equipment in some professional environments where standard headphones are prohibited. Safety regulations in construction and industrial settings often ban devices that block hearing. Bone conduction headphones are compliant in most of these contexts.
Supported Devices
Puente recognizes and auto-configures the following:
Shokz (formerly AfterShokz):
- OpenRun series (including OpenRun Pro)
- OpenFit series
- OpenSwim series
- Legacy AfterShokz models (Aeropex, Titanium, etc.)
When any of these are connected via Bluetooth, Puente switches automatically to solo/mono mode. The translated audio routes through a single channel that the bone conduction transducer handles cleanly, rather than splitting into a stereo signal that loses half its signal on a mono output device.
Setup Steps
-
Pair your Shokz or AfterShokz headphones to your iPhone via Settings → Bluetooth. Hold the power button on the headphones until you hear the pairing prompt, select the device from the iOS Bluetooth list.
-
Open Puente. The app detects the connected device and switches to solo/mono mode automatically. The mode indicator in the app confirms the configuration.
-
Set your language pair as you normally would.
-
Start a translation session. Translated audio plays through the bone conduction transducer. You can speak normally — the iPhone microphone picks up your voice even while your headphones are on, since your ears aren’t covered.
Construction Site Use Case
A foreman is conducting a materials inspection with a subcontractor who speaks Spanish. The site is active — forklifts moving, power tools running, concrete mixers turning. In-ear earbuds would block the foreman’s environmental awareness. Speakerphone is inaudible over the noise.
With Shokz OpenRun connected to their iPhone and Puente running in solo/mono mode, the foreman speaks English and hears the Spanish response translated through the bone conduction transducer. They also hear the forklift backing signal behind them, the site manager calling their name from across the yard, and the compressor cycling. No safety awareness is compromised. The translation session runs in parallel with normal environmental hearing.
Medical and Clinical Use Case
Clinical environments have their own reasons to prefer open-ear audio. A nurse conducting a medication history intake with a Spanish-speaking patient can wear bone conduction headphones and receive translated audio without blocking their ears to alarms, call lights, or colleagues. The patient sees the nurse listening attentively — no foreign-looking hardware, no obvious technology intermediary — because the transducer pads sit unobtrusively against the cheekbones.
Outdoor and Athletic Use Case
Shokz headphones are popular with runners, cyclists, and hikers because they’re designed for open-ear outdoor use. For athletes who train or compete in multilingual environments — international competitions, multinational sports camps, cross-border hiking groups — Puente with bone conduction provides translation while maintaining the full outdoor audio awareness that makes bone conduction headphones the choice for outdoor activity in the first place.
Cost Comparison With Dedicated Hardware
Timekettle, a company that makes dedicated translation earpieces, sells the W4 model at around $200. The hardware is good — but it’s a single-purpose device requiring its own app, its own account system, and its own upgrade cycle.
If you already own a pair of Shokz (MSRP $80–160 depending on model), adding Puente costs $9.99 one-time. Bone conduction also works in offline mode — no signal needed on remote job sites. You get the same open-ear translation capability, plus all of Puente’s other features — 109 languages, offline mode, Group Mode, Profession Packs — on the phone you already carry.