This Phone 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 Telephone Transmitter, Mobile Phone Sensor, 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. Just connect your landline phone to the Telephone Transmitter, place the Mobile Phone Sensor on the screen of your cell phone or tablet, and then attach the Mobile Phone Sensor to the Telephone Transmitter. When there are incoming calls, messages, or social media notifications from your landline phone, cell phone, or tablet, 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 cell phone ringers are the great signaling system to help people with hearing loss, hard of hearing, and deaf to stay in touch with family and friends.