14 DAY TRIAL // In addition to the UHS-I SDHC/SDXC memory cards, Silicon Power has also released a line of microSD models, meant for compact gadgets.
Not smartphones though, unless they're supposed to support UHS-I specification. Instead, they're intended for compatible DSLR, cameras, HD camcorders and 3D cameras.
They have very high performance, succeeding in reading data at up to 95 MB/s and writing it at 45 MB/s.
They should be able to store up to 90 minutes of video in 4K resolution (4096 x 2160 pixels). Well, the 32 GB card can anyway.
You should be able to turn the cards into an SDHC card via an adapter, which should ship in the same package. Sadly, we don't know the prices. In its press release, Silicon Power only mentioned the lifetime warranty (product lifetime, which means more or less until the cards stop shipping in retail).