A wireless memory card device includes a casing having a width, a length, and a thickness for supporting an integrated power supply. The device has one or more solar cell modules spatially disposed on a first portion of the casing. The device further includes a power supply control circuitry coupled to the one or more solar cell modules for providing regulated voltages to the device. In addition, the device includes a flash memory module provided in a second portion of the casing and a wireless communication module provided on a third portion of the casing. The device further includes one or more antennas coupled to the wireless communication module for transmitting and receiving data packets to and from a host system. The device additionally includes a power-on switch and an indicator signal for indicating the wireless data transfer between the device and the host system.