This Push Button Notification package from Bellman & Symfon is part of the Visit Smart Home System that helps you to keep tabs on your home. This package includes a Push Button Transmitter, Portable Receiver, and Bed Shaker. Those alerting devices in this package are already paired as a system and ready to use out of the box. The Push Button Transmitter is lightweight and can be portable as a call-for-attention button or put outside the door as a doorbell button. When someone presses the button, you will be alerted with colored LEDs and audible sounds with adjustable volume up to 90dB from the Portable Receiver and strong vibrations from the Bed Shaker which will wake up even the heavy sleepers. The Portable Receiver is powered by batteries so you can easily bring it with you and place wherever you like. This package alerting device is a great signaling system to help people with hearing loss, hard of hearing, and deaf not to stay connected.