Convenient UseIdeal for use as an alarm for those who need quick help, such as the elderly, children, disabled, pregnant women or patients, sick. Simply press the call button to get timely and considerate care. It can also be used as a doorbell. Widely used in home, hospital, community, restaurant, office and so on. Easy to use: plug the receiver into the socket where you need to be remembered. The waterproof transmitter can be worn as a pendant or placed next to the bed. 90~250V main powered receiver works with transmitter with low power consumption and long standby time. 52 alarm options 80m range52 alarm sounds to choose from, with LED light flashes alarm. 4-level adjustable volume, max. 110dB, ideal for the elderly. No switch is designed to prevent missing the important emergency alarm. Up to 80 meters range in open area (walls and other objects reduce the range), no interference from other devices. Call mode: press the SOS button once (1-2 seconds), the receiver will alert once. If you need a continuous alarm, please press the SOS button repeatedly. Low battery indicator: 1. If no operation, but the LED indicator of the transmitter flashes, this means that the battery is low; 2. The pairing between transmitter and receiver may be lost after changing the battery, pair it manually to repair it. 3. Use a flat screwdriver (not included) to lift the side of the transmitter to replace the battery. NOTE: 1. The size of the product is measured manually, and there will be an error of 2-3mm due to factors such as different measurement tools and measurement methods. 2. This product is all taken in kind, but due to differences in photography, lighting, color deviation, and personal understanding of color. As a result, there may be some color difference between the actual product and the photo, and the color is subject to the actual product. 3. Please take good care of our products