Compact Structure & Super Light Weight: portable to use and store, providing you a better using experience. High Precision & Fast Response: adopts gas-sensitive semi-conductor sensor for fast detecting and has wide reaction range(50~1000ppm). 6.6-inch Long Probe: the long probe allows you to freely detecting in a narrow place. Visible & Audible Dual-way Alarm: when combustible gas leakage is detected, the buzzer will sound and the concentration indicator will be on. Low Power Consumption: powered by 2pcs AAA batteries (NOT included), with low battery indication, long standby and easy for replacement. Auto Power Off: when no concentration is measured within 5 minutes, the meter will automatic shutdown. One button to power on-off manually. Specifications: Sensor: Gas-sensitive semi-conductor Reaction Range: 50~1000PPM (methane) Reaction Sensitivity: . Less than 50ppm (methane) Warm-up Time: . 30s Reaction Time: 500ppm: . 5s, 500ppm: . 2s Alarm Mode: Visible and audible Operating Condition: 0~50, 20~80%RH Storage Condition: -10~60, 20~80%RH Power Supply: 2 * AAA battery (NOT included) Material: plastic colour: black Package Contents: 1 x Gas Leak Detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.