Word length 1 plays single characters; 2+ plays English words of up to that many letters (Русский always plays single characters). Char speed is the per-character (element) speed for playback; set it higher than Speed for Farnsworth timing (fast characters, wide gaps), or equal for standard spacing. Settings are stored in this browser and apply to all pages. AI keys (for Chat) are kept only in this browser and are never sent anywhere but the provider you choose.