We know 2 variations of the SanDisk Ultra Dual Drive m3.0 with the above specifications:

SanDisk 256GB Ultra Dual Drive m3.0, microUSB and USB Type-A, High-speed USB 3.0, Retractable design for Android Devices and Computers - SDDD3-256G-G46
For $28.25 on Amazon (As of Dec 21, 2025, 11:10 PST - Details)

SanDisk 256GB Ultra Dual Drive m3.0 for Android Devices and Computers - microUSB, USB 3.0 - SDDD3-256G-GAM46, Black
For $24.99 on Amazon (As of Dec 21, 2025, 01:17 PST - Details)