--- title: ZecTrix Note 4 – A 4.2-inch ESP32-S3 wireless e-paper... description: ZecTrix Lab has released the Note 4, an ESP32-S3-based smart note device featuring a 4.2-inch e-paper display, built-in microphone and speaker, Wi-Fi,... canonical: https://daily.dev/posts/zectrix-note-4-a-4-2-inch-esp32-s3-wireless-e-paper-display-for-voice-tasks-8pkdqaxrg twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: ZecTrix Note 4 – A 4.2-inch ESP32-S3 wireless e-paper display for voice tasks | daily.dev og:description: ZecTrix Lab has released the Note 4, an ESP32-S3-based smart note device featuring a 4.2-inch e-paper display, built-in microphone and speaker, Wi-Fi,... og:url: https://daily.dev/posts/zectrix-note-4-a-4-2-inch-esp32-s3-wireless-e-paper-display-for-voice-tasks-8pkdqaxrg og:image: https://api.daily.dev/og/posts/8pKdQAXrG.png og:image:alt: ZecTrix Note 4 – A 4.2-inch ESP32-S3 wireless e-paper display for voice tasks og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # ZecTrix Note 4 – A 4.2-inch ESP32-S3 wireless e-paper display for voice tasks **[CNX Software](https://daily.dev/sources/cnx-software)** · 4 min read · 0 upvotes · 0 comments ## Summary ZecTrix Lab has released the Note 4, an ESP32-S3-based smart note device featuring a 4.2-inch e-paper display, built-in microphone and speaker, Wi-Fi, Bluetooth 5.0, NFC, and a 2,000mAh battery. A Note 4C variant offers a four-color e-paper panel. The official firmware uses a cloud-based Qwen3.5 AI voice assistant (currently Chinese-only, English preview planned before September 2026), but community firmware projects enable use cases like AI coding voice input (OpenAI Codex, Claude Code), transit displays, and information dashboards. The device supports GPIO expansion and open-source 3D model files for DIY enclosures. The premium edition is available on Tindie for $54.99, while the Note 4C is sold on Taobao for approximately $148. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [This 7.3-inch ePaper display is the perfect choice for your next ESP32 project](https://daily.dev/posts/this-7-3-inch-epaper-display-is-the-perfect-choice-for-your-next-esp32-project-wqabi0fdj) · XDA Developers · 0 upvotes · 0 comments - [An ESP32-S3 e-paper development board with 3.97-inch touchscreen, LoRa, and NFC](https://daily.dev/posts/an-esp32-s3-e-paper-development-board-with-3-97-inch-touchscreen-lora-and-nfc-j6zceqyxi) · CNX Software · 0 upvotes · 0 comments - [An ESP32-S3-based color e-Paper badge with open firmware \(Crowdfunding\)](https://daily.dev/posts/an-esp32-s3-based-color-e-paper-badge-with-open-firmware-crowdfunding--mqvjeoyil) · CNX Software · 0 upvotes · 0 comments - [This E-Paper PDA Wants You to Ditch Your Smartphone for a Keyboard and Two Tiny Screens](https://daily.dev/posts/this-e-paper-pda-wants-you-to-ditch-your-smartphone-for-a-keyboard-and-two-tiny-screens-agmcospox) · It's Foss · 0 upvotes · 0 comments --- Tags: [#iot](https://daily.dev/tags/iot), [#embedded](https://daily.dev/tags/embedded) [View this post on daily.dev](https://daily.dev/posts/zectrix-note-4-a-4-2-inch-esp32-s3-wireless-e-paper-display-for-voice-tasks-8pkdqaxrg) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"ZecTrix Note 4 – A 4.2-inch ESP32-S3 wireless e-paper display for voice tasks","url":"https://daily.dev/posts/zectrix-note-4-a-4-2-inch-esp32-s3-wireless-e-paper-display-for-voice-tasks-8pkdqaxrg","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/zectrix-note-4-a-4-2-inch-esp32-s3-wireless-e-paper-display-for-voice-tasks-8pkdqaxrg"},"datePublished":"2026-08-05T04:58:10.741Z","dateModified":"2026-08-05T04:58:58.142Z","description":"ZecTrix Lab has released the Note 4, an ESP32-S3-based smart note device featuring a 4.2-inch e-paper display, built-in microphone and speaker, Wi-Fi,...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/2f84dabe09079b74d98980177b267e44?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/2f84dabe09079b74d98980177b267e44?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"CNX Software","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"CNX Software","logo":"https://media.daily.dev/image/upload/s--xozLJZc---/f_auto,q_auto/v1780213507/logos/cnx-software?_a=BAMAMiWQ0","url":"https://daily.dev/sources/cnx-software"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/zectrix-note-4-a-4-2-inch-esp32-s3-wireless-e-paper-display-for-voice-tasks-8pkdqaxrg","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"iot,embedded","timeRequired":"PT4M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"CNX Software","item":"https://daily.dev/sources/cnx-software"},{"@type":"ListItem","position":3,"name":"ZecTrix Note 4 – A 4.2-inch ESP32-S3 wireless e-paper display for voice tasks"}]} ```