Duracell professional usb flash drives are available from 8gb to 128gb capacities. they feature a convenient capless design with a retractable usb connector to protect your data while in transit. simply push or pull to expose and retract the connector. with peak sequential read/write speeds of 100/5 mbps (megabytes per second) the duracell professional usb 3.0 drive offers ultra fast data transfer speeds. (usb 3.0 port required).