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The systems require a one or three year contract.security alarm monitoring
2 Ionization Detectors7. 2. 1 Market Estimates and Forecast, 2018–20237. 2. 2 Market Estimates and Forecast by Region, 2018–20237. 3 Photoelectric Detectors7. 3. 1 Market Estimates and Forecast, 2018–20237. 3. 2 Market Estimates and Forecast by Region, 2018–20237. 4 Dual Sensor Detectors CO and CO27.