Black Shark has released a new smartwatch rated to support "ENC" voice-calls via Bluetooth 5.3 to help track the user's blood oxygen, heart rate, sleep and stress. Nothing out of the ordinary about that - were it not for the fact that this new GT3 has the same kind of curved display and chassis normally only found in the ultra-premium OPPO Watch 4 Pro. The AMOLED-screen wearable is valued at just under $80, but is listed for nearly 60% off that price right now.