Q: How do I know the camera is recording without a screen or indicator light?

A: A short haptic vibration on the temple arm confirms recording start/stop. For extended recording sessions, the companion app provides a live viewfinder and battery/recording status via WiFi connection to your phone.

Q: Can I wear prescription lenses with the Frame Lens?

A: The Frame Lens ships with non-prescription UV400 lenses. However, the lens mounting system is compatible with standard optician fittings — you can have prescription lenses cut to the Frame Lens template at any optical shop. An adapter template is included in the box.

Q: How does the footage transfer to my phone, and what file format does it use?

A: Footage is stored as .MP4 (H.264) files and transfers to your phone via WiFi through the companion app at approximately 8–10 MB/s. The app also supports auto-offload when the glasses are charging, and you can select specific clips by timestamp rather than dumping the entire storage.

Q: Is the 90-minute battery life sufficient for a full day of riding?

A: For continuous recording, 90 minutes covers most urban commutes. For longer rides, the loop-recording mode overwrites oldest footage when storage is full, ensuring the most recent 4 hours of footage is always preserved. The glasses can also record while charging from a handlebar-mounted USB power bank via the magnetic cable.

Q: Are the glasses comfortable for all-day wear?

A: At 28 grams — roughly the weight of two AA batteries — the TR90 frame exerts minimal pressure on the nose bridge and temples. The flexible arms accommodate head widths from 135–155 mm. For most users, the glasses are comfortable for 6–8 hours of continuous wear, comparable to a quality pair of everyday sunglasses.