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, Flash 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 or Flash Receiver. When there are incoming calls, messages, or social media notifications from your landline phone, cell phone, or tablet, you will get alerted with colored LEDs and bright flashing lights from the Flash Receiver and strong vibrations from Bed Shaker which will wake up even the heavy sleepers. The backup batteries on the Flash Receiver will keep the device fully functional even during power outages. Simply place the Flash Receiver in your living room, bedroom, or kitchen, and you will notice the bright flashing lights even from rooms away. This cell phone notification package is a great signaling system to help people with hearing loss, hard of hearing, and deaf to stay in touch with family and friends.