112 inches flexible gooseneck probe with a highly sensitive sensing tip, it could detect the gas quickly and accurately, please make sure the sensing tip is clean before using 2When the gas leakage occurs, the gas concentration reaches the alarm concentration, the led light will flash and remind you, accompanying am alarm in a loud sound, play a timely reminder, to ensure personal safety 3With power led indicator, it can help you to know whether the detector is normally working, and it is also very easy and convenient to use with the Off/On button 4Our detector is operated by 3pcs AAA batteries(not included), with a lower power consumption, and you could easily replace the batteries by yourself 5Our gas detector is highly sensitive, it could detect all kinds of halogen gas, such as frozen gas, air conditioning, halon gas, ethanol gas, refrigerant, including Chlorine and Fluorine etc