Youdao previously lacked its own hardware R&D and manufacturing team, and needed to find a partner with full-chain ODM capabilities, including electronic paper hardware design, SMT production, and overall quality control.

The product was required to be extremely thin and portable, with an eye-friendly e-ink screen that emitted no blue light, ultra-long battery life, and capable of supporting Youdao's self-developed Ebbinghaus forgetting curve algorithm and synchronizing with multiple versions of textbook dictionaries, while also meeting the urgent mass production needs for market launch.

We provide Youdao with an ODM solution for e-ink electronic vocabulary flashcards: Youdao Electronic Vocabulary Flashcards M3/M6, featuring zero blue light and flicker-free screens, preventing eye strain during extended vocabulary memorization sessions, and eliminating game and push notification interference for a pure learning environment.

Weighing only about 30g, the flashcards are small enough to wear around the neck or fit in a pencil case; they incorporate the Ebbinghaus forgetting curve algorithm for automatic review scheduling and support multiple learning modes including flashcards, spelling, dictation, and quizzes; a single charge provides 100-150 days of standby time, and they are ready to use with Type-C fast charging.

Suitable for primary and secondary school students to quickly review vocabulary during 5-minute breaks; university students to memorize CET-4/6 and postgraduate entrance exam vocabulary during subway commutes; and students preparing for overseas exams to efficiently review TOEFL, IELTS, and GRE vocabulary during spare moments.