The new 418MHz Signature Series uses radio frequency technology, allowing you freedom and flexibility with outstanding features and increased range of up to 2,000 feet. Quickly know when you have visitors, telephone calls or emergencies with the bright flashing strobe and distinctive LEDs. The Signature Series Transmatter transmits to the Sidekick II Receiver that flashes when someone steps on this mat. Indoor use only. Place on top or under rugs. Five year warranty for transmitter. One year warranty for mat. What else do I need to make this work? This product will only work with 418MHz products in the Silent Call Signature Series. In order to be notified, you will need to purchase a Silent Call Signature Series Receiver.