| Frequency response | 20 Hz–20 kHz nominal response, with a smooth midrange | Check independent measurement graphs rather than relying only on the stated range. Listen for clear vocals, controlled bass, and non-harsh treble. | 20 Hz–20 kHz broadly covers the commonly cited human hearing range, but the shape and consistency of the response affect sound quality more than the advertised endpoints. |
| Open-ear sound leakage | Low leakage at normal listening levels; no obvious sound to nearby listeners in ordinary indoor use | Play speech and music at a comfortable volume and ask someone standing approximately 0.5–1 m away whether the content is clearly audible. | Open-ear speakers do not seal the ear canal, so leakage and reduced privacy are inherent considerations. |
| Maximum practical loudness | Clear speech and balanced music without audible distortion at a safe, comfortable level | Test podcasts, music, and phone calls in a quiet room and outdoors. Avoid judging quality only at maximum volume. | Open-ear audio competes with environmental noise, but excessive volume can increase hearing risk and distortion. |
| Bluetooth version and profiles | Bluetooth 5.2 or later; support for A2DP, AVRCP, and HFP | Confirm the supported profiles and test pairing, reconnection, media controls, and call switching with your phone. | Bluetooth version alone does not guarantee sound quality. Profiles determine core music, control, and hands-free calling functions. |
| Bluetooth LE Audio support | Optional but valuable: Bluetooth LE Audio with LC3 codec and compatible-device support | Check whether both the glasses and the phone support LE Audio; verify stable playback and call performance in actual use. | LC3 is designed to provide improved efficiency and useful audio quality at lower bitrates, but benefits depend on compatibility. |
| Codec compatibility | AAC and/or aptX where supported; SBC as a universal baseline | Match the glasses' codec list with the codecs available on your phone. Test for dropouts rather than assuming a higher-bitrate codec is always better. | The active codec is negotiated by the source device and glasses; codec support does not replace good acoustic tuning. |
| Microphone performance | Clear voice pickup with wind-noise reduction and reliable performance in moderate background noise | Make calls indoors, near traffic, and outdoors in light wind. Ask the other caller to evaluate clarity and background noise. | Microphone placement and noise processing strongly affect call quality, especially because the microphones are not close to the mouth. |
| Battery life | At least 5–8 hours of continuous audio; charging case preferred for multi-day use | Compare tested playback time at a stated volume and with features such as calls or voice assistants enabled. | Actual runtime varies with volume, Bluetooth features, microphone use, temperature, and battery age. |
| Charging method | USB-C charging with a full charge in approximately 1–2 hours | Confirm whether the charging cable is included and whether the glasses can be used while charging. | USB-C simplifies charging, while a case or rapid top-up improves daily convenience. |
| Water and sweat resistance | At least IPX4 for sweat and light splashes; higher ratings are preferable for outdoor use | Check the exact IP rating and its limits. IPX4 indicates protection against water splashes, not submersion. | Water-resistance ratings are specific to test conditions and do not automatically cover saltwater, chemicals, or prolonged immersion. |
| Frame and total weight | Approximately 35–50 g for comfortable extended wear, subject to frame design and fit | Wear the glasses for at least 30 minutes and check pressure on the nose, ears, temples, and behind the head. | Weight distribution and frame balance often matter more than total weight alone. |
| Latency | Approximately 100 ms or less for comfortable video viewing; gaming may require a low-latency mode | Watch speech-heavy video and compare lip movement with audio. Test with the intended phone and application. | Perceived delay depends on the codec, operating system, app, phone, and whether a dedicated low-latency mode is enabled. |
| Device connectivity | Stable connection across at least 8–10 m in open indoor conditions | Walk between rooms and place the phone in a pocket or bag. Check for interruptions near Wi-Fi routers and crowded wireless areas. | Bluetooth range varies with antenna design, obstacles, interference, phone placement, and local radio conditions. |
| Controls and voice assistant | Reliable physical or capacitive controls for play, volume, calls, and voice-assistant activation | Use controls while walking and wearing gloves if relevant. Check accidental activation and tactile feedback. | Convenient controls reduce the need to handle a phone, but touch controls can be difficult in rain or cold conditions. |
| Prescription-lens compatibility | Clear compatibility with prescription inserts or professional lens replacement | Confirm supported lens types, fitting limits, replacement costs, and whether changing lenses affects the warranty. | A correct optical fit is essential for daily wear and may determine whether the glasses are practical as primary eyewear. |
| Safety and situational awareness | Open-ear listening that allows awareness of nearby voices, traffic, and alarms at moderate volume | Use the glasses in a quiet area and outdoors, while keeping volume low enough to hear important environmental sounds. | Open-ear audio can support environmental awareness, but it does not eliminate distraction or replace safe behavior around traffic and machinery. |