Practical & Reliable Ideal as an alert system for those needing quick assistance – seniors, children, people with disabilities, pregnant women, or the unwell. Simply press the call button for timely attention without shouting. It also functions as a doorbell. Long Range Up to 180 meters range in open areas (walls and objects will reduce range). 16-bit encoding eliminates interference from other devices, ensuring reliable function throughout your home. Multiple Alert Options 45 sound selections (36 melodies and 9 alarms) and three alert modes (Sound + Light, Sound Only, Light Only). Adjustable volume in 3 levels, max 110db, ideal for seniors. No power switch is designed to prevent accidental power-offs that could miss a crucial emergency call. (If unused for an extended period, remove batteries to preserve lifespan). Convenient Placement The waterproof transmitter can be worn as a pendant or placed by the bedside. The receiver can be wall-mounted, free-standing on a desk, or carried in a caregiver's pocket. Low Battery Indication 1. Without operation, if the unit's indicator light continues to flash or produces abnormal sounds, replace the battery; 2. The transmitter and receiver connection may be lost after battery replacement. This isn't a fault; simply re-pair them manually to fix.