Detection sensitivity: 0 to 25.0 vol% (0.1 vol%) or 0 to 50.0 vol% (0.5 vol%) Detection method: galvanic battery-operated Gas target gas: O2 (oxygen) Product name: Main unit set (dry batteries) Gas alarm display: 2-stage alarm 1st: concentration display and backlight on (橙色)/蜂鸣器 第二:(红色)/蜂鸣器 外部输出|气警察接触(2个电路): - 外部输出|气体浓度信号:DC0至1V(非绝缘) 警报设置值:检测范围0至25.0 vol%:1ST19.0 VOL%(L)/2nd18.0 Vol%(LL)检测 电源:2 x AA电池(包括)(包括)(包括)