The TR90-made frame accommodates stereo speakers and two 90 mAh batteries, as well as all the circuitry needed to operate the speakers and microphones. Bluetooth 5.0 should be enough for most users, and the AAC codec supported provides unexpectedly good sound (I expected a disaster based on some reviews that I managed to read before taking the Doogee AJ01 out of the box).
I listened to music for a few good hours using YouTube as the sound source and I was amazed by the audio quality compared to what I expected. Using the maximum volume allowed by the phone, I got more than 6 hours of autonomy on a full charge, which is more than Doogee advertises. However, when I placed a few phone calls, the incoming audio quality was pretty bad, as the voices had a metallic, distorted sound. Surprisingly, voice-focused music sounds great. On the other hand, the microphones seem to work great, as reported by the people I talked to. Recording my voice on my phone via the Doogee AJ01 also produced very good results.
When talking about the sunglasses part, I wasn’t impressed, and the colors of some phone displays were heavily modified by the lens. On the bright side, the lenses can be replaced, so this shouldn’t be considered a huge drawback, and it also might have something to do with the way that I perceive colors.
The time needed for a full charge is about 90 minutes and a weight below 50 grams shouldn’t be a problem to anyone. However, the one-size-fits-all approach might not get the job done for people with small or large heads, especially since there are no nose pads to adjust.