Pan-sea three rivers. One of the top ten brands of Oceanwide Sanjiang Smoke Alarm, founded in 1994, is a subsidiary of China Oceanwide Group, and is the main supplier of fire detection alarm/extinguishing system, fire-fighting Internet of Things solutions and building safety and intelligent solutions in China. Lanheng Company mainly produces fire safety equipment such as gas alarm, smoke alarm and water immersion detector, as well as smart home equipment such as intelligent gateway, remote controller, socket and switch. Among them, Lanheng's smoke alarm is still doing well, and the sales of online e-commerce platforms are also very good.