The leak seams to point that OnePlus is preparing to enter the smart watch market.
According to BGR which managed to get the scoop on this story, the soon to be announced OnePlus OneWatch will rock a Sapphire glass-protected circular OLED screen and titanium borders, making for a that much harder to break product.
Design wise, OnePlus wanted to make its device look more like a regular watch, hence it included a crown that can be used to configure the smart watch. The provided leather strap is said to house a curved battery, that can be charged wirelessly with Qi chargers.
Unfortunately, we don’t have other details — like whether the OneWatch will run Android Wear or some custom OS. Perhaps OnePlus opts for its own version of Android.