Description Convenient use Ideal as an alarm for those who need help quickly, such as the elderly, children, disabled, pregnant women or sick patients, simply press the button to call for care and timely care. It can also be used at the door. Widely used in home, hospital, community, restaurant, office, etc. Easy to use Plug the receiver into the power outlet wherever you want. Remember that the waterproof transmitter can be worn as a pendant or at the bedside. . The 90~250V powered main receiver works with a low-power transmitter that boasts a long standby time. 52 alert options and 80 m range. 52 alert sounds to choose from, with a flashing LED light. Volume adjustable in 4 levels, max 110 dB, ideal for the elderly. No switch is designed to avoid missing the important emergency alarm. Range up to 80 meters in open area (walls and other objects will reduce range), no interference from other devices. 2 alarm modesCall mode: press the SOS button once (1-2 seconds), the receiver will sound an alarm. Emergency mode: Keep pressing the SOS button for 3 seconds or more, the receiver will give a continuous alarm until you press the volume button on the receiver. Low battery status indication 1. If no operation is performed 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 defective, just pair manually to repair.