Getting BT Notifier application to link U8 Smart Watch with No Carrier Nexus 7
I just got the V8 Plus.  I couldn't get it to pair to my Nexus 5 stock with the BT Notifier.  However, it did pair with both of these applications

MediaTek Smart Device

FunDo Smart Device

Both those applications look very similar once they're installed.

Once it paired I could make calls from the watch, remotely trigger the phone camera, see text messages, etc.