Phone and Doorbell Notification The Swedish designed Bellman Visit wireless alerting system notifies people about important signals and alarms in difficult listening Âsituations. With the Bellman Visit system, you can easily detect your doorbell Âtelephone rings. By adding other Visit transmitters, you can also be notified to the smoke alarm, your baby's Âcrying and more. All these functions are Âintegrated into a well-designed wireless system. Two year warranty. Visit Value Pack 2 Features: Allows the user to move around inside and outdoors. Visual flashing light alert. Alerts to the doorbell and incoming telephone calls. Portability: take this system with you when you travel. Flexibility: add-on accessories provide other notification. Wireless system; all batteries are included. Approximate operating range in open field about 260 feet (90 yards); walls and other large objects may greatly affect coverage. The Visit Value Pack 2 with Flash Receiver includes: 1 Visit Door Transmitter: alerts to the doorbell 1 Visit Telephone/Multi-Purpose Transmitter: alerts to telephone calls 1 Visit Flash Receiver: table-top receiver alerts with a powerful distinct flashing light and visual colored light indicators on the receiver What else do I need to make this work? This is a complete notification system that comes with all the items necessary for phone and door notification. You may purchase additional Visit Transmitters to add to this Value Pack for other notifications.