Check the listing for details. Silent Call Signature Series Weather Alert Transmitter. Condition: New. Listed at 99.70 USD. The Signature Series™ by Silent Call® 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. This weather alert transmitter plugs into you weather radio (such as the Midland Weather Alert Radio SC-WX67) to notify you of severe weather emergencies in your area. Features:Range up to 2 000 feetLow battery indicator Silent Call Promise: 5 Year Warranty, Superior Customer Support and Next Business Day ReturnsSilent Call products are manufactured in the US, where they test and inspect every product to ensure the highest level of quality. Silent Call backs their products with this promise: Direct manufacturer 5 year warranty service and warranties serviced directly through Silent Call can expect next business day returns. What else do I need to make this work?This product will only work with products in the Silent Call Signature Series. In order to be notified, you will need to purchase a Silent Call Signature Series Receiver (see Accessories).