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Hi Smokskis, this is normal behavior for the CyberPower SL750U UPS when it switches to battery power. You can mute the alarm by quickly pressing the POWER button twice. Default: Alarm ON Two short beeps = Alarm turned OFF One short beep = Alarm turned ON When the alarm is off, there will be no audible warning at low battery. If you hear any other type of beeping, contact CyberPower Technical Support. CyberPower Technical Support (U.S. / Canada) Phone: 1‑877‑297‑6937 Hours: Mon–Fri, 6 AM – 8 PM (CST)
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