Neutrogena Light Mask - Mod to: Disable Timer - Change Batteries - Remove Use limit - Hack - YouTube
Amazon.com : Unlimited Activator, Reusable General Purpose Battery or Power Pack (Enhanced) by LiiHot : Health & Household
How to hack Neutrogena light therapy mask : r/AskElectronics
My girlfriend's acne mask uses this to work and only contains 30 charges. After the uses she has to buy a completely new one of these every time : r/assholedesign