How much does this cost to the nearest dollar?

Natural Gas Detector, Home Gas Alarm, Natural Gas Leak Alarm, Gas Leak Detector
Home gas detector suitable for detecting LPG, natural gas, coal gas, gas fuel, artificial gas, liquefied petroleum gas, liquefied natural gas etc. Gas Detector offers Voice Notification and a digital readout of the GAS concentration.When gas leak concentration reaches presetting level, the alarm provides a visual and audible signal. 85dB alarm sound, reduce the risk of gas explosion and protect your family's life and property safety. This product can be used as independent family alarm equipment, and also can be used as front detector of alarm system. Widely Used for Restaurant, Hospital,Hotel. Gas leak detector adopts Easy-to-install Design, can be used by plugging directly into the power socket to detect

Price is $21.00

Price: $20.99