6.Power supply 6V( 4x“AA”1.5V alkaline batteries, but not included according to Post office shipping requirement) Package Includes: 1*MS6310 combustible gas detector 1*User manual Specifications: Specifications Range Sensitivity 50 ppm methane Sensor Solid State Alarm 10%~40% LEL Warm-up Approx. 2minute Response Time <; 2 seconds Duty Cycle Intermittent Battery life Approx.9 hours continuous use typical Operating Temperature 0 ~50° Operating Humidity 10 ~90% RH (non-condensing) Dimensions 172×70×46 mmWelcome to visit us,if you have any questions, please feel free to ask us. We will give you a very satisfactory shopping experience.