Toothbrush Teardown
Full teardown of an EC Technology electric toothbrush
EC Technology Automatic Sonic Electric Toothbrush on amazon.co.uk
http://amzn.to/2ijkhAr
Replacement brush heads:
https://www.amazon.co.uk/dp/B076KJP4FY
https://www.amazon.co.uk/dp/B076KPKXTC
Data sheets:
https://www.iamtao.com/product/539746883067/
http://www.on-bright.com/cn/english/products_mcu.htm