Disclosure: As an eBay Partner and Amazon Associate, Which Memory Card may earn a commission from purchases. About Us →
💡 Tip: On eBay you can choose between Brand New or SanDisk Refurbished options depending on your budget. What's the difference? →
Max Official Capacity: 256GB (Tested up to 256GB)
Setup / Formatting: exFAT or FAT32 (Plug & Play)
Minimum Speed Class: USB 3.2
Technical Note: Blink Sync Module 2 enforces a strict 256GB maximum USB size—drives 512GB+ are rejected by the Blink app.
⚠ Manufacturer Warranty Notice: Western Digital specifically excludes continuous recording (dashcam and CCTV use) from standard consumer card warranties. Only dedicated High Endurance and MAX Endurance models are covered. View Western Digital / SanDisk Official Warranty Terms ↗
📋 Official Spec / Manual Source: Blink Official Support — Local USB Storage with Sync Module 2 Specs ↗
Need help formatting or fixing an error? See our guides for Windows 10/11, Mac, Dashcam/Camera Card Error Fix, or Garmin Card Degraded Fix.
Get a 128GB or 256GB SanDisk Ultra Fit Compact USB 3.2 Flash Drive. Blink Outdoor 4 / Blink Mini 2 & Video Doorbell (Sync Module USB) uses a USB Flash Drive (Plugs into Sync Module 2) rated USB 3.2. The Blink Sync Module 2 uses a full-size USB port (not a microSD card) to save local doorbell and camera clips without a monthly subscription.
The official maximum supported capacity for Blink Outdoor 4 / Blink Mini 2 & Video Doorbell (Sync Module USB) is 256GB (tested up to 256GB). For the best balance of price and reliability, our recommended sweet-spot size is 128GB.
64GB ≈ 3–6 months of motion clips • 128GB ≈ 6–12 months • 256GB ≈ Max supported capacity (~70,000 clips). Choosing 128GB gives plenty of headroom without overpaying.
Do NOT buy a 512GB USB stick for Blink—256GB is the maximum supported size. A low-profile nano USB stick prevents accidental knocks. Standard consumer cards (such as SanDisk Ultra) are not built for continuous loop recording and wear out quickly. Crucially, Western Digital's official warranty terms explicitly exclude dashcam and surveillance use on standard consumer cards (only dedicated High Endurance and MAX Endurance models are covered by warranty). Blink Sync Module 2 enforces a strict 256GB maximum USB size—drives 512GB+ are rejected by the Blink app.
Setup requirement: exFAT or FAT32 (Plug & Play). Plug the USB drive into the USB port on the Blink Sync Module 2. Open the Blink app, go to Sync Module settings > Local Storage, and tap 'Format USB Drive' if prompted.
Yes. Unbranded or counterfeit marketplace cards frequently spoof their capacity or fail to sustain USB 3.2 write speeds, leading to corrupted recordings or 'Card Error' warnings. Stick to genuine, branded cards from a reputable retailer to ensure full manufacturer warranty coverage.
Disclosure: Which Memory Card is an independent flash storage guide. As an eBay Partner and Amazon Associate, we may earn a commission from qualifying purchases at no extra cost to you. About Us & Verification Methodology →