Drive One uses both sounds and lights to notify of road issues and how the Drive One app is working. 

Here you can see what the individual sounds and lights mean:

Messages from the Drive One device about connections

Green light blinks once - device beeps once

The Drive One device is now awake and ready to be paired with the Drive One app on your phone

Continuous green light - multiple beeps from the device

The Drive One device is now paired with the Drive One app on your phone

Yellow light - three beeps from the device

Drive One is awake but cannot find a phone to connect with.

Tip: Make sure that your phone has Bluetooth functionality enabled.

Warnings from the Drive One device

Blue light and fast beeping sounds

A Drive One user has reported that there is a speed trap nearby so make sure you are driving within the legal limits.

Red light and increasing siren sound

A Drive One user has reported that there is some kind of hazard nearby, so pay attention to your surroundings and the road.