Really nice product. Build quality is very good, works as advertised. Need to use the instructions to connect to a Windows 7 PC: 1) Download the software PM2.5 from the link in the listing 2) Download the USB-Serial Driver CH340 https://www.driverscape.com/download/usb-serial-ch340 3) Connect the monitor to a USB port 4) START > Device Manager 5) You will see an "unknown USB device" with a question mark under USB devices 6) Click > Update Driver - browse to the downloaded file 7) Check Port assignment once driver updated - COM port number 8) Startup the PM2.5.EXE from the download and set the COM Port from the one in device manager and the baud rate to 115200 > SAVE.

Really nice product. Build quality is very good, works as advertised. Need to use the instructions to connect to a Windows 7 PC: 1) Download the software PM2.5 from the link in the listing 2) Download the USB-Serial Driver CH340 https://www.driverscape.com/download/usb-serial-ch340 3) Connect the monitor to a USB port 4) START > Device Manager 5) You will see an "unknown USB device" with a question mark under USB devices 6) Click > Update Driver - browse to the downloaded file 7) Check Port assignment once driver updated - COM port number 8) Startup the PM2.5.EXE from the download and set the COM Port from the one in device manager and the baud rate to 115200 > SAVE.

Really nice product. Build quality is very good, works as advertised. Need to use the instructions to connect to a Windows 7 PC: 1) Download the software PM2.5 from the link in the listing 2) Download the USB-Serial Driver CH340 https://www.driverscape.com/download/usb-serial-ch340 3) Connect the monitor to a USB port 4) START > Device Manager 5) You will see an "unknown USB device" with a question mark under USB devices 6) Click > Update Driver - browse to the downloaded file 7) Check Port assignment once driver updated - COM port number 8) Startup the PM2.5.EXE from the download and set the COM Port from the one in device manager and the baud rate to 115200 > SAVE.

Works as advertised. To connect to windows 10 running computer. Download file in description section link. Unpack. Connect Monitor to any USB2 port. In WIN10 R click START > Device Manager. You will see a question marked device R click > Update Driver from internet. It will install USB SERIAL CH340 (COM#) . R click properties > port settings > bits per second to 115200 > OK. Then startup the PM2.5.EXE from the download and set the COM# to your # assigned in device manager and the baudrate to 115200 > SAVE program will immediately start up registering the monitor. Equipment>Setting for registration intervals and monitor time sync. So relax and breath easy I hope =:)

Works as advertised. To connect to windows 10 running computer. Download file in description section link. Unpack. Connect Monitor to any USB2 port. In WIN10 R click START > Device Manager. You will see a question marked device R click > Update Driver from internet. It will install USB SERIAL CH340 (COM#) . R click properties > port settings > bits per second to 115200 > OK. Then startup the PM2.5.EXE from the download and set the COM# to your # assigned in device manager and the baudrate to 115200 > SAVE program will immediately start up registering the monitor. Equipment>Setting for registration intervals and monitor time sync. So relax and breath easy I hope =:)

Works as advertised. To connect to windows 10 running computer. Download file in description section link. Unpack. Connect Monitor to any USB2 port. In WIN10 R click START > Device Manager. You will see a question marked device R click > Update Driver from internet. It will install USB SERIAL CH340 (COM#) . R click properties > port settings > bits per second to 115200 > OK. Then startup the PM2.5.EXE from the download and set the COM# to your # assigned in device manager and the baudrate to 115200 > SAVE program will immediately start up registering the monitor. Equipment>Setting for registration intervals and monitor time sync. So relax and breath easy I hope =:)