The Pulsar+ single-gas detector detects CO, H2S, and O2. According to the manufacturer, the features include simplified autocalibration at the push of a button; a gas concentration display; durable design; excellent water and dust resistance; replaceable, long-life, 123-type lithium battery; replaceable, leakproof, stainless steel Button™ sensors; triple alarm system with piercing audio and visual and optional vibrating alarms; and a strong, versatile clip.