This Optional Remote part # BBURC works only with the following part #'s

BB1230
BB1260
BB122470
BB123670
BB124870
BB242435
BB241235 

* Available in White, Black, Grey or Red color remote variants:

This is an optional product and not required for operation of the main product, however features of the remote are:

• Reads Input and Output voltages of the Battery to Battery charger.
• If optional temperature sensor for the Battery to Battery charger is installed it can read the temperature of the output battery.
• Can display temperature in Fahrenheit and Celsius
• Can turn the unit on and off from the remote
• Can put unit into float mode from remote
• Can put unit into ½ current mode from remote
• Can put into night mode which makes the charger operate at ½ the output and runs the fans at ½ speed for 8 hours to help reduce noise for light sleepers.
• Displays any product warning alarms
• This remote comes in a standard 50mm threaded housing and fits into a 54mm hole cut
• Comes  with a 10 meter telephone wire style cable.

Understanding the Sterling Power Pro Batt Ultra – Battery to Battery Charger, Article by Marine How To:
https://marinehowto.com/understanding-the-sterling-power-pro-batt-ultra-battery-to-battery-charger/