This is a 12v buzzer with a red LED. The buzzer is powered by a device cabable of switching 12v directly or indirectly via a relay. For example, our MCU, EVCC or BMSC can control the buzzer. One of the most common uses is to alert the operator to low pack cell voltages when under load.
The buzzer operates with either terminal connected to positive 12v. It mounts from the panel front in a 7/8" hole, and includes a retainer nut and wire terminals.