Applicable Gases: Methane and Carbon Monoxide Sampling Method: Natural Diffusion Sensors: Semiconductor sensor and electrochemical sensor Alarm Setting Value (Methane): 5LEL% Carbon Monoxide Alarm Value: No alarm sounds for concentrations under 50ppm. At 50-99ppm, the alarm sounds within 60-90 minutes. At 100-299ppm, the alarm sounds within 10-40 minutes. At 300ppm or higher, the alarm sounds within 3 minutes. Environmental Conditions: Indoor temperature -10°C to 55°C, relative humidity less than or equal to 95% RH Response Time: Less than 30 seconds Recovery Time: Less than 60 seconds Alarm Modes: Audible and visual alarm Alarm Volume: Up to 70dB (1 meter in front) Lifespan: 3 years Power Consumption: Less than 3W Measuring Range: 0-20% for methane, 0-999PPM for carbon monoxide Output Contacts: Pulse DC12V or 12V actuator signal Plug Type: EU plug (compatible with Indonesia, Germany, France, Spain, Italy, etc.) Voltage: AC100-240V Color: White Material: ABS Size: 75x40x120mm Package Contents: 1 x UL Carbon Monoxide Gas Two-in-One Alarm Kit Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. The allowable measurement error is +/- 1-3cm.