The DSC WT4911 WT4911B Two-Way Wireless Outdoor Siren is a high-quality alarm system accessory designed for outdoor use. With its brand name of DSC and model number WT4911, this siren is reliable and efficient in alerting potential intruders. The two-way wireless feature allows for easy installation and operation, making it a great addition to any alarm system setup. This new in box product ensures that your property is protected by a trusted and well-known brand in the industry. Buyer adds usps shipping