Inquiry about Solar-Powered Remote Activated Warning Siren System

We are developing a community emergency warning network for rural villages in Nigeria that lack mobile network infrastructure. We need a solar-powered warning siren solution with battery backup, capable of remote activation and independent of public mobile networks. The system must provide emergency tones, live voice announcements, and pre-recorded messages, and be suitable for outdoor installation in a tropical climate with coverage up to 5 km per site. We require recommendations on suitable siren models, deployment architecture, solar and battery configurations, and pricing for multi-village deployment.