First, enter configuration mode

1. Press Mode 
2. Enter 1234 
3. Press Mode again

Adjust inbound listen volume 

1. Enter configuration mode
2. Select:  02 – Monitor volume 
3. Enter a new value for Inbound Listen Volume (Max is 20) 

Adjust outbound talk volume 

1. Enter configuration mode
2. Select:  02 – Monitor volume 
3. Enter a new value for Outbound Talk Volume (Max is 20) 

Adjust vehicle present (beeper) volume 

1. Enter configuration mode
2. Select:  02 – Monitor Volume 
3. Enter a new value for Vehicle Present Volume (Max is 20)

Adjust vehicle approach volume 

1. Enter configuration mode
2. Select:  02 – Monitor volume 
3. Enter a new value for Vehicle Approach Volume (Max is 20)