Detection : diffusion type Detected gas: Ammonia 2-year sensor life Preheating time: 60 seconds Working voltage: 3.7V (lithium battery capacity 1800mAh) Standby time: Can be used continuously for more than 10 hours in a fully state Charging time: 4-6 hours Response time: T Less than 30s Detect gas/concentration: gas type and range optional Working temperature: -20 C~+50 C Working humidity: 10% -95% RH Output form: sound/light/vibration alarm output Adopting electrochemical and catalytic combustion methods Industrial three prevention design: dustproof, waterproof, and explosion-proof LCD display of real-time data/system status/channel information viewing/alarm recording Multiple operation settings: high/low alarm threshold settings Zero point setting Calibration settings time setting Backlight Setting Password settings Triple alarm: light, vibration, and live voice (in both Chinese and English) prompts Built in 1800mAh rechargeable lithium battery Low battery reminder Protection level; Ip65 Explosion proof sign: ExicIIBT3Gb Colour:Black Material:plastic Package Contents: 1 x 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.