# Now that's one way to block annoying online ads — developer uses a $5 dongle to squeeze in 537,000 domains into just 4MB of flash memory

> Egyptian developer demonstrates how to block ads with an ESP32-C3 "SuperMini" boardESP32 ad-blocking dongle costs just $5 to build537,000 blacklisted domains are stored in the device’s 4MB of flash memory When online…

- **Source:** [TechRadar](https://www.techradar.com/pro/now-thats-one-way-to-block-annoying-online-ads-developer-uses-a-usd5-dongle-to-squeeze-in-537-000-domains-into-just-4mb-of-flash-memory?utm_source=gearopen.com&utm_medium=referral&utm_campaign=feed&utm_content=6a615e9ed73bc3a34f79c6a6)
- **Published:** 2026-07-23
- **Category:** Smart Home
- **Tags:** #developer #domains #flash #online #block #device #dongle #memory
- **Canonical:** http://localhost:4321/a/6a615e9ed73bc3a34f79c6a6

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_GearOpen's distilled summary. The full original article is published at TechRadar (source link above); GearOpen does not republish the source's full text._