When Charging
Blue solid - Fully charged
Red solid - Charging
When Not Charging
No LED - Sensor is powered off
Blue solid - Waiting for Qlipp Tennis app to connect
Blue blinking (2 short flashes and 1 long pause) - Connected
Red solid - Waiting for Qlipp Tennis app to connect, but low battery
Red blinking (2 short flashes and 1 long pause) - Connected, but low battery
Red slow flash (1 long flash and 1 long pause) - Unexpectedly disconnected from device (usually due to out of range)