This is the black version of USA Scalar (USA003). Unique design combines analog with digital for Wear OS watch. The hour top section is a circular analog showing time, you can read the minute digital in the center. And also a digital second at the bottom. The time is available only in 12-hour mode. Installation and troubleshooting guide here: https://youtu.be/JywevNu4Duc This watch face requires Wear OS API 28+. Compatible with Galaxy Watch 4 Series and newer, Tic Watch, latest Fossil, and many others. Tap and hold the watch face and go to the "customize" menu (or settings icon under the watch face) to manage the custom shortcut complication. To show the heart rate, stay still and tap the heart rate area. It will blink and measure your heart rate. The heart rate will be shown after the successful reading. If the heart rate stay showing 0, then you need to allow the sensor permission, do the following steps : 1. Switch to any other watch face 2. Switch back to USA Scalar Black 3. Sensor permission request will pop, allow it 4. If HR still showing 0, you need to refresh it once again. 5. Switch to any other watch face once more time 6. Switch back to USA Scalar Black , tap the HR area to see if it works Special designed Always On Display ambient mode. Turn on the Always On Display mode on your watch settings to show a low power display on idle. Please be aware, this feature will use more batteries. Join our Telegram group for live support and discussion https://t.me/usadesignwatchface