Bluetooth Headphones, Bluetooth 5.0 Wireless Earphones in Ear Stereo Sound Microphone Mini Wireless Earbuds with Headphones and Portable Charging Case for iOS Android PC XA-2

Needed for work and just used for first couple of meetings and great sound

The monitor is easy to use, and seems to work well. I cannot comment on the accuracy, but the readings seem to be low when the windows are open, and gradually increase after they are closed, so O.K. for my purpose. Rising rates remind me to open windows again.

Ordered and delivered on time. They tie adequately.

portable easy to use and clear monitor for measuring carbon dioxide as a proxy measure of ventilation for reassurance if concerned about being in indoor venue and coronavirus transmission

Great product!