Convenient UseIdeal as an alarm for those who need help quickly, such as the elderly, children, disabled, pregnant women or sick patients, just press the button to call for caring and timely care. It can also be used at the door. Widely used at home, hospital, community, restaurant, office, etc. Easy to Use Plug the receiver into the power outlet wherever you want remember, the waterproof transmitter can be worn as a pendant or at the bedside. The 90~250V powered main receiver works with a low power consumption transmitter which enjoys long standby time. 52 alert options and 80m range52 alert sounds alert to choose from, with a flashing LED light. 4-level adjustable volume, max 110db ideal for the elderly. No switch is designed to avoid missing the important emergency alarm. Up to 80 meters range in open area (walls and other objects will reduce the range), no interference from other devices. 2 alarm modesCall mode: press once press the SOS button (1-2 seconds), the receiver will issue an alarm. Emergency mode: keep pressing the SOS button for 3 seconds and more, the receiver will alarm continuously until you press the volume button on the receiver. Indication Low Battery Status 1, If no operation but the LED light on the transmitter keeps flashing, it means the battery is low, please replace the batteries; 2, The pairing between transmitter and receiver may lose contact after battery replacement, the items are not faulty, just manually pair to fix.