metal crystal gold stainless steel rotary key chain fashion usb flash 8gb 16gb pendrive 32gb pen drive memory stick u disk

specification:.storage capacity: 4 gb / 8 gb / 16 gb / 32 gb / 64 gb.ambient temperature: -40 c- + 70 c.storage temperature: -50 c- + 80 c.usb operating voltage: 4.5 v-5.5 v.lifetime storage: more than 10years.use class chip, can be erased repeatedly for 100,0000vezes.operating system: win98 / me / 2000 / xp / vista / win7 / win8, os 9.x or above linux2.4.usb connection: plug play support..easy to read and read in high speed, there is no need to drive / power supply only plug in..to val