Specifications: Model: GD-3300 Material: ABS+Electronic Component Color: Gray Probe Length: 16in Measuring Range: 0~100% Sensor Type: Solid State Warm-up Time: Approx.1min Sensitivity: 50ppm (based on methane) Response Time: Less than 2s (up to 40% LEL) Duty Cycle: Intermittent Alarm Limit: 10% LEL for Methane Battery: 3×1.5V C/R14 Batteries (NOT included) Item Size: 221 * 72 * 46mm / 8.7 * 2.83 * 1.81in Item Weight: 272g / 9.59oz (without battery) Package Size: 12.4 * 26.9 * 6.9cm / 4.88 * 10.59 * 2.72in Package Weight: 620g / 21.87oz Note: * Please read the user manual carefully before using this product. * There may be slight errors due to manual measurement. Package List: 1 * Gas Leak Detector 1 * Storage Bag 1 * User Manual