** LunaR is only enhancing the power when the amount of light emitted is more than 10k lux.
1. Make sure the watch is connected to your phone.
"Settings"--"Hot key"--"Find my phone"--"OK", Double Pressing the left button, your phone will vibrate and make a sound.
2. If it's a sunny day, go outside and make sure there is no covering over the watch face. Wait for 2 minutes, "Harvesting status" should be changed from "stand-by" to "Charging".
Or, you could try with an iPhone torch. Turn it on and put it against the watch dial (the torch has to be in touch with the watch face), "Harvesting status" should also be changed from "stand-by" to "Charging".