Outfitted with rapid-response MSA XCell sensors, the ALTAIR 4XR Gas Detector is the toughest 4-gas monitor on the market. The ALTAIR 4XR can also provide real-time incident awareness to team members, supervisors, safety managers and others when paired with the MSA ALTAIR Connect app via a Bluetooth wireless connection. SpecificationsBattery Type: Rechargeable Lithium-PolymerHeight: 1-3/8"Gas Type: LEL, O2, H2S, COWidth: 3"Display: MonochromeAlarm Setting: AdjustableHousing Colour: BlackWeight: 2 lbs- SKU: ORSNO307037