The Klein Tools Combustible Gas Leak Detector, No. ET120, offers five red LEDs and 85db audible alerts that increase with gas concentration. This detector has a detection range of 50 to 10,000 ppm (based on Methane). This tool also features automatic zero-point calibration at power-up, an 18" flexible gooseneck to expand the sensor's reach, auto power-off after 10 minutes of non-use and an electrochemical sensor with up the seven years of life. The tool includes the detector, four AAA batteries, an instructional manual and a storage pouch. This gas detector is not intended for use as personal protection equipment (PPE).