This is a tri-chrome plated LED battery gauge. It is designed to help monitor the condition of the charging system. This unit measures about 2" by 3/4" and connects to the bike with only two wires. It has a built in sensor to adjust the LED's to be brighter during the day and dimmer at night in addition to having a flashing LED to warn of an extreme condition. It attaches with double sided tape and fit all Goldwing 1500's from 1988-00 as well as all Goldwing 1800's from 2001-07.  K4219