Summary: I recently Purchased 2 Viewsonic 10pi tablets with 64 GB built in memory. I purchased these two 64 GB Memory chips to augment the memory but found the tablet couldn't read the new chips. I was using 32 GB memory chips in my Digital HD camera and tried the new 64 GB chips which worked fine.
Summary: Lightning fast data transfer. I didn't test the waterproof function, although I installed it in an ADDIXXION WEBCAM by JVC (submersible webcam) and did not subject it to water. FLAWLESS performance, HUGE data capacity, and reliable SanDisk quality. HIGHLY RECOMMENDED!!!