DV RS-MMC is the new Dual-Voltage Reduced Size MMC card that works on 1.8v and 3.3v. Some new Mobile Phones, like the Nokia 6630 and 6680, will not work with a standard RS-MMC 3.3v card. They need this dual voltage memory card that can work on 1.8 volts.
You are buying an Integral DV RS-MMC card with 1 GB memory.
These come with a 5-year manufacturer's warranty.