Description Sensor Type: Optical. Supply Voltage: 230V AC, 50Hz. Battery Back-up: 9V Alkaline Replaceable. Sound Level: 85dB(A) at 3m. Operating Temperature: 0°C to 40°C. Humidity Range: 15% to 95% relative humidity. Button Test: Simulates the effect of smoke and checks chamber, electronics and horn. Self Test: Smoke chamber is automatically tested every 40 seconds and unit beeps (without red LED flash) if it is degraded. Insect Screen: Prevents insects or debris entering chamber (1.00mm mesh size). Plastic Material: UL94VO flame retardant. Dimensions – Product: 150mm dia. x 55mm Dimensions – Boxed: 155mm x 155mm x 65mm Weight: 325g (product only), 410g (boxed) EAN: 5099383002348