Check the listing for details. Silent Call Signature Series Weather Alert Transmitter WT-SS. Color: N/A, Condition: New. Listed at 99.70 USD. hrlyAkKpRk0' frameborder='0' allowfullscreen> 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). Return Policy Returns will not be accepted without a Return Merchandise Authorization Number (RMA). Refused Delivery: It will be subject to a 20% restocking fee. The customer will also be responsible for the return shipping cost incurred by the action of refusing the delivery. Consequently, amount of refund will be issued less 20% restocking fee of the value of the merchandise and less shipping and handling fees both ways. All shipping and handling fees are non-refundable with an exception where we have made an error by shipping and incorrect item to the customer.