The ELD will power ON when the engine is started. In the case when the ELD does not power ON with an engine start, you can hold the white button on the bottom of the ELD until it powers ON. When the ELD is turned ON, you will see this screen
When the engine is turned OFF, the ELD will automatically power itself OFF and go into sleep mode after about 5 min of engine OFF. Make sure to be in the correct status, whether it’s On Duty, Off Duty, or Sleeper Berth before leaving the vehicle.