This XLA Alert 4-in-1 detector is definitely the right choice to protect your health and property,Hang the instrument on your clothes and enter the on-site environment with you. When the instrument detects harmful gas, it will sound, light, and vibrate triple alarms to remind you to leave the environment. Our multi-gas detector used advanced integrated circuit technology, embedded microcomputer control, high quality imported gas sensor, excellent sensitivity and excellent repeatability. Technical Parameter: Gas Type Range EX 0-100%LEL H2S 0-100PPM CO 0-1000PPM O2 0-30%VOL Packing List: 1 * Detector 1 * Packing box 1 * User manual 1 * USB line 1 * Plug 1 * Mask Product Parameters Precision: ≤ ± 5% FS Response Time: T<30s Working Environment: -20°C ～ 50°C; <95% RH (no condensing) Power Source: DC3.7V Li-on battery, 1800mAh Protection level: Ip65 Gas Sensor Life: 2 years Protection Grade: IP65 Weight: 300g (with battery) Dimensions: 140mm × 73mm × 32mm (L × W × H) Charging time: 4h-6h Standby time, Continuous use for more than 8 hours at full charge Indication mode: LCD display real-time data and system status, lighting, vibration and live English voice recording tips