I use the app: SmartWatch from PlayStore. Unfortunately I am not satisfied.
1. I get neither Hangouts, still displayed WhatsApp messages on the device.
2. The display is very difficult to read in bright light (sun).
3. The display is not so nice and sharp, like the one pictured above-.
4. I can not find any option that the firmware can be updated.
At present I can not recommend to buy this wonderful SmartWatch. I have allowed to test recently a Sony SmartWatch 3. This is worlds better (but more expensive). AndroidWear I prefer the homemade of U8.
Since my clock a China import is (Shit happens), I am writing this part from a flawed gadget.
Perhaps there is here still someone who has a good tip?