Chelsea Senior Living Selects HealthSignals to Create Safer Environments for their Residents and Staff HealthSignals LLC Installs ERRC at Chelsea Senior Living in Sparta and Clifton, NJ News provided by Share this article Share this article KING OF PRUSSIA, Pa., Dec. 18, 2020 /PRNewswire/ -- HealthSignals LLC recently installed an Emergency Responder Radio Coverage (ERRC) system at two of Chelsea Senior Living's newest facilities located in Sparta and Clifton, New Jersey. ERRC systems are crucial to first responders as they allow their radio signals to penetrate walls, ceilings, and floors, ...