The CD4 (X) multi parameter gas analyzer, equipped with a 32-bit microprocessor and imported sensors, can simultaneously measure four gases: methane (CH4), oxygen (O2), carbon monoxide (CO), and hydrogen sulfide (H2S). The product is displayed on a 2.0-inch true color LCD screen, with vibrant colors. The ergonomic design of the body provides users with a good grip. High capacity internal storage chip, capable of storing data for up to 3 months. Cascaded charging base minimizes cable clutter as much as possible. The whole machine has passed explosion-proof certification, safety standard certification, and IP68 protection level, and can be used in Class I coal mine underground hazardous areas. The full range of alarm points can be set, with three alarm prompts triggered simultaneously: a prominent red high brightness LED light, a high decibel buzzer, and a vibration motor.