Solu &reg;Mq-7 Carbon Monoxide Co Gas Sensor Detection Module for Arduino//mq-7 Mq7 Co Carbon Monoxide Coal Gas Sensor Module Compatible//mq-7 Mq7 Carbon Monoxide Co Gas Sensor Module for Arduino UNO Mega 2560 Usually, you will get it actually in 9~19 days, If you are in the USA and the item is NOT Fulfilled by Amazon. the item will be sent to you by USPS with shipping information from China. The estimated delivery time offered by Amazon is not the real time. Your patience is highly appreciated. Hope you will receive your item soon and enjoy using it. About us (Solu ), Professional factory of circuit boards for Arduino.Power and TTL signal output indication. Mainly used for CO collection detection in family, factory, underground operation Has better sensitive detection for carbon monoxide. Has a long service life and reliable stability.