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 $38.90 on Amazon (As of May 31, 2026, 11:20 PST - Details)

SANDISK 256GB Ultra Dual Drive m3.0 for Android Devices and Computers - microUSB, USB 3.0 - SDDD3-256G-GAM46
For $41.99 on Amazon (As of May 31, 2026, 15:03 PST - Details)