: Long-press the Play/Pause/Power button for 3 seconds. A prompt sound will confirm the device is active.
Check the title page. If the manual says "Yayusi S2 Series," it covers the base model, Pro, and Plus. If it says "Yayusi S2 (Standard Only)," it does not. The Plus model has a different mainboard (often a 32-bit board vs. 8-bit on the standard). Yayusi S2 Manual Pdf
Keep the device away from liquids, fire, and high-temperature or high-moisture environments. : Long-press the Play/Pause/Power button for 3 seconds
While a digital PDF is searchable, a physical copy is safer in a greasy, dusty workshop environment. " it covers the base model