The key switch has 3 positions, ON, OFF and Lock (lock image)
OFF – device is off
ON – Device is on with hardware buttons enabled. In this mode, you have the ability to use the physical buttons on the RadStar or use the mobile app to control the device via Bluetooth
LOCK – The RadStar should be in the Lock position whenever a test in in process. The LOCK position disables the physical buttons on the RadStar. While in LOCK position, you can connect to the RadStar using the Mobile app and start/end tests.