Pros: Excellent sound quality out of box, big and fairly tight bass, comfortable and small for dual driver earphone, English voice prompt,
Cons: Can't charge using power bank, short battery life
Small blue box about 10cm height. Only come with micro usb charger cable and 3 pair silicone tip.
Preferred way to wear, cable and remote under chin, neck. You can put the cable behind the neck too.
Size comparison with Jogger Pro
Avantree Jogger Pro, above ear behind neck wear only
Blue transparent housing showing off dual 9mm and 7mm driver, with yellow tip from LZ-Z03A. Remote on right side of cable. Centre multifunction button; on-off, start-pause music, receive-end call. + button, short press forward music play, long press volume up. - button function the other way round. Microphone hole is on the other side. It work well for call. The other side of calller can hear me clearly.
Cable attached to the housing are actually memory wire with transparent plastic cover. Functional and comfortable at the same time.
Proper wall charging only. All 4 power bank that I own with multiple cable failed to charge it. Full charge about 2 hours. With continuous Bluetooth music play from smartphone it lasted roughly about 2.5 - 3 hours. None of the Moxpax own commercial or manual stated the true battery capacity but I guess it may have 60-100mA battery. Expected since the battery is on the remote which is slightly larger than remote without built in battery. Anyone expected bigger battery please look elsewhere. The battery capacity is not the selling point fot this X90.
Sound quality ;
Big bad bass. Tight and thumping only slightly slower in bass response when compared to excellent earphone like Rock Zircon. Vocal is clear, however treble is not as bright as I like but still acceptable. With fairly short battery life there is no way that I can properly burn in the dual driver to their intended optimal performance. But luckily out of the box the sound is already excellent so further burn in is not really necessary.
Comparison with Avantree Jogger Pro ;
No bass, tinny metallic sound, low volume. The sound quality is just lacking. But it is very secure and has amazing 12 hours battery life. Just charged once. Dig it out in few months and it still has few hours of battery life. Waterproof too. With X90 you keep on wondering just when it will run out of juice.
When you minus the terrible battery life, you still has one hell of an audiophile grade Bluetooth headset at a budget price. No wonder it selling very fast over Aliexpress. Just one wish, double the battery capacity on Mark II version.