Product Name: ADKS-4 Gas Detector Measuring gas: oxygen carbon monoxide hydrogen sulfide Display error: less than equal ±5% Response time: TLess than 30s Indication method: LCD displays real-time data and system status LED, sound, vibration to indicate alarm, fault and undervoltage working environment: Temperature: 20Celsius~50Celsius; Humidity: Less than 95%RH without condensation Working voltage: DC3.7V (Lithium battery capacity 2000mAh) Charging time: 6h~8h Standby time: more than 8 hours Protection class: IP65 Size: 130x65x45mm Weight: about 1kg Colour:orange Material: ABS Package Contents: 2 x Multi Gas Detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.