With no internal battery, the glasses never need charging and stay lighter. The tradeoff is permanent USB-C tethering to a powered source device.
Pros: heads-up display, charging method
Cons: low-light visibility, Bluetooth connectivity
Best Smart Glasses for charging method
Drawing power from the connected device keeps the glasses light and avoids another battery to charge, but the required cable and adapters can complicate charging while using them.
Pros: offline functionality, cloud dependency
Cons: tracking stability, power efficiency
The magnetic connector attaches securely, but the proprietary dongle is easy to lose and inconvenient for travel. Reviewers repeatedly wished for standard USB-C or a bundled case.
Pros: prescription lens compatibility, temple comfort
Cons: outdoor visibility, camera privacy
Charging depends on the proprietary case, which is inconvenient if the case is lost or unavailable.
Pros: media playback, lens clarity
Cons: low-light visibility, heads-up display