Sensitive and easy to operate, this four-in-one gas detector detects oxygen, combustible gas, carbon monoxide, and hydrogen sulfide, and is customizable. All the features you need are included. Technology stems from innovation, quality stems from rigor. Applicable Applications: Widely used in industries such as petroleum, chemical engineering, environmental protection, metallurgy, refining, gas transmission and distribution, biomedical engineering, and agriculture. Triple alarms: sound, light, and vibration, alerting when gas concentrations are too high or too low. The large LCD display features adjustable backlighting for convenient nighttime use, with both constant light and automatic light modes. Hign-concerned Chemical:None Type:Other Model:Gas series Intelligent type:Other Intelligence Color: As Shown Material: ABS Package Contents: 1 set * gas detectors