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UMP™ Chair and Bed Sentry Systems feature loud or soft alarm volume settings (100 or 90 dB), optional nurse-call (cable not included), low-battery warning light, and convenient on/off switch. When switched on, the box will beep once when the resident sits, signaling an operational mode. Requires four AA batteries, sold separately. UMP offers a choice of pads for both bed and chair. Choose 45-day, 90-day, 6-month, 1-year, or 15-month guarantee.