PHILIPS One By Sonicare Battery Toothbrush, Midnight, Hy1100/04, 1 Count : Amazon.ca: Health & Personal Care
PHILIPS Sonicare ProtectiveClean Removes up to 2X More Plaque, Long Lasting 14 Day Battery Life Rechargeable Electric Toothbrush : Amazon.ca: Health & Personal Care
Sonicare toothbrush teardown: microcontroller, H bridge, and inductive charging