Alarm peak query function Alarm point setting function Super-smart voice function 4 concentration unit conversion Suitable gas: natural gas Concentration alarm: 1-25%lel £¨500-12500ppm£© Alarm set: 05-99kppm or 10-198%lel Input power: 37v 2600mah lithium battery Static current: ¡ü200ma Alarm current: ¡ü500ma Response time: £¼30 second Alarm sound: £¾80 decibel (from 1m) Sensor:japanese electrochemistry sensor Agent query function Alarm peak query function Smart voice alarm and digital display Alarm point settings Concentration unit conversion Black