briefly used, then realized we don't need two of them. price firm picture shows it plugged in and working, once it is charged, you can unplug and use for up to 30 days. must clean and change filters every 2 weeks. comes with a new filter. I have a 4 pack (that would last an additional 2 months) if you would like, otherwise there is a QR code to scan to find on their website or Amazon. any questions, let me know!