Hi, I recently received the device (in December 24) with the proprietary connection.

Yes attention... I have "a" very narrow gap, which is sometimes continuous and sometimes completely closed... The appliance is still the best I've ever had. You just have to be careful when setting the strength. If you set it very high, it can sometimes hurt, so set it lower. I clean inside and out, which is perfect. The appliance is very good

According to the manufacturer, these are compatible with every Philips Sonicare Power Flosser Philips Sonicare Sonicare F3 Quad Stream nozzle (oral irrigator attachments)

Cashback campaigns are carried out directly by the manufacturer, we refer to them but do not advertise them throughout the entire term.

The product here is the HX3826, while the other is the HX3806. The difference has already been answered directly by Philips https://www.galaxus.ch/de/s6/questionandanswer/den-power-flosser-gibt-es-als-hx3806-und-als-hx3826-ich-finde-den-unterschied-nicht-wenn-ich-auf-der-616813 In addition, the HX3806 is currently only available from one marketplace supplier. So if you prefer to use the model with USB-C, I would at best wait a little longer to see if cheaper offers are added.