PIR sensor works out of the box. I use it with a ESP8266/MySensors node to send the data to MQTT. Only remark I would have is that the batteries are a bit fiddly to get in. Because the spring and the raised support from the casing - the spring doesn't always sit nicely in the middle of the battery; initially the PIR did work properly because the spring was barely touching the (-).
Shipping was not super fast but it got here no problem. Seller was quick to respond to my questions.
I use these with a seeeduino nano (which has an onboard Grove I2C socket) and a second-hand USB power brick/cellphone charger in a food storage container as a cheap sensor node which students can deploy in class rooms and around their school.
The vendor has also been helpful and responsive to questions.