How do you stop the beeping for Belkin Battery backup during a power outage?

It looks like there is a "mute" button on the BBU provided you have a Belkin unit:

Front-Panel Label	Visual Indicator	Audible Alarm	Description
On A/C	Green LED lights	None	The RG Battery Backup is operating on A/C
	Green LED flashes	None	The RG Battery Backup is conducting a self-test. This automatic procedure is normal
On Battery	Yellow LED lights	Tone every 5 seconds	The RG Battery Backup is operating on battery power. The alarm will stop when main power is returned.
Low Battery	Yellow LED flashes	Tone every 1 second	The battery energy is running low. This alarm will continue until the unit performs a forced shutdown when the battery is depleted.
Replace Battery	Red LED flashes	Tone every 2 seconds	This alarm warns that the battery has reached the end of its useful life. The user must replace the battery as soon as possible to ensure proper operation of the RG battery backup.
Fault	Red LED lights	Continuous tone	A fault has occurred

NOTE: Audible alarm will not sound when mute switch is in ON position