[Convenient and Reliable] Ideal for the elderly, children, disabled, pregnant women or patients who need quick help because the caregiver's nanny cannot accompany patients or people disabilities all the time, just press the phone button without calling you can receive timely and thoughtful care Can also be used as a doorbell Long range: Up to 400 meters in open areas (walls and other objects will reduce the distance), 16-bit encoding is used to eliminate interference from other devices, delivering the performance you need to work almost anywhere in your home. [Easy to place] The waterproof transmitter comes with a lanyard, which can be worn as a pendant or placed at the head of the bed. The receiver can be hung on the wall with a string and placed on a table or in the caregiver's pocket.