【Practical Use】Perfect as an alert for people needing quick assistance, such as the elderly, children, disabled, pregnant women, or patients. Simply press the button for quick and caring attention; it can also be used as a doorbell. Commonly used in homes, hospitals, communities, restaurants, offices, etc. 【Easy to Use】Plug the receiver into the power outlet where you need to be reminded. The waterproof transmitter can be worn as a pendant or placed by the bed. The receiver, powered by a 90~250V mains supply, works with a low-power consumption transmitter that has a long standby time. 【52 Alarm Options & 80m Range】52 alarm sounds to choose from, with a flashing LED alarm. 4-level adjustable volume, max 110db ideal for the elderly. No power switch is designed to avoid missing the crucial emergency alarm. Up to 80-meter range in open areas (walls and other objects will reduce the range), no interference with other devices. 【Conversation Mode】Press the SOS button once (1-2 seconds), the receiver will alarm once. If you need continuous alarming, press the SOS button multiple times. 【Low Battery Indication】1. If no action but the transmitter's LED indicator keeps flashing, it means the battery is low, replace the batteries; 2. The connection between the transmitter and receiver may be lost after replacing the battery, manually pair them to repair; 3. Use a flat-head screwdriver (not included) to pry open the side of the transmitter to replace the battery.