This product uses a first-line brand smoke gas sensor probe to measure the concentration of smoke in the air, and it has a high sensitivity to smoke in the higher concentration range. This product uses imported 485 chips and multiple protections for the 485 interface, which can effectively cope with the interference of surges and pulses in the industrial field. It can communicate reliably within the full baud rate range of 1200-115200, which is at the leading level in the industry.