The GasAlertQuattro four-gas detector is rugged and reliable and combines a comprehensive range of features with simple one-button operation, with easy compliance and visual auditing. Compact and lightweight design makes these gas detectors comforatble to wear all day. Continuous LCD displays real-time gas concentrations. Built-in concussion-proof boot and IP66/67 rating makes these detectors suitable for field use. Verify operation from a distance by looking for the IntelliFlash green LED with user-defined flash frequency. Additional Features: include one-button operation, data/event logging, audible/visual/vibrating alarms, user adjustable alarm set points, sensor self-test, and multilanguage capability (English, French, German, Spanish, and Portuguese). Approvals: CE; CSA Class I, Div. 1, Groups A, B, C, D; ATEX Specifications:   Gasses Measured: O2, CO, H2S, Combustibles (LEL) Range: CO: 0 to 1000 ppm O2: 0 to 30.0% H2S: 0 to 200 ppm Combustibles: 0 to 100% Alarm: six red LEDs visual alarm, vibrating alarm, and 95dB audible alarm Power: three AA alkaline batteries