The tCheck device will cycle through a variety of color changes depending on the activity of the device. Those activities are represented by lights. Here is what they are:
All PURPLE - Device Firmware Update (DFU) mode.
All GREEN - Power On Self Test.
All RED - Very low battery. Does not perform measurements.
RED-RED-WHITE - Power On Self Test (POST) fail.
BLUE-BLUE-GREEN - Device ready. Waiting for BLE (Bluetooth Low Energy) connection.
All BLUE - BLE connected.
BLUE-BLUE-PURPLE - The device is currently running a test (measurement).
All YELLOW - Low battery. Change batteries soon.
If you experience any issues with lights please check the following FAQs for more information: