1. Alarm wireless patient and elderly person alarm. Convenient and reliable: It is suitable for the elderly, children, disabled, pregnant women or patients who need quick help, because caregivers cannot be with the sick or disabled all the time. Just press the button, and you can receive timely and considerate care without shouting. It can also be used as a doorbell. 2. Long range: Up to 400 meters in an open area (objects such as walls shorten the distance), with 16-bit coding to reduce interference from other devices, providing the performance needed to work in many places at home. 3. Easy to place: The waterproof transmitter is equipped with a strap, which can be worn as a pendant or placed on the head of the bed. The receiver can be hung on the wall with a string, placed on a table or carried in the caregiver's pocket. 4. Package contents: 1*lens transmitter+1*host