Classic Terrestrial Radio (Two-Way Radios / Walkie-Talkies) Advantages: Highly reliable during emergencies — works independently of cellular networks or internet. Instant push-to-talk with no dialing delays. Excellent coverage in buildings, tunnels, and remote areas. Long battery life and rugged durability. One-to-many broadcasting reaches entire teams simultaneously. Disadvantages: Limited range without repeaters. No text, photos, videos, … Continue reading Comparison of Communication Systems for Campus Security