Certifications: Wireless Hub Core – Links Devices: Smoke: S05-R8-B, Heat: H01-R8, CO: C02-R8, Gas: DHI-HY-GA20A-R8 One-Touch Control: Test entire network, locate the source of an alarm, or silence all units with a single press Ultra-Long 1000m Wireless Range: advanced 868MHz frequency Instant Visual Threat Indicators: Dedicated LED lights for Fire, CO, and Faults Supports 24 Devices Expansion – Fits Large-Space Needs Maintenance-Free 10-Year Battery: Powered by a non-replaceable 3V lithium battery