DENSO Plasma Cluster 25000, a cigarette lighter socket-powered air purifier. - Brand: DENSO - Model Name: Plasma Cluster 25000 - Function: Air Purifier - Power Type: Cigarette Lighter Socket - Operation Buttons: Filter Maintenance/Reset/Operation Switching Thank you for viewing. This is quite an old item. I am unable to confirm power-on as I do not currently have a car with a cigarette lighter socket at home. It was working without any problems until I removed it.