3-Stage Push-Pull DesignWID 10 usb flash drive 256 gb adopts a dual-interface 3-stage push-pull design, ensuring a smooth push-pull process without any lag, with firm and secure interfaces. The push-pull design of WD10 portable ssd provides better protection for the usb thumb drive 256gb interface and solves the problem of the cover being easily lost or damaged. (Note! Push the push-pull button forward to the end and hear a click before the interface is secured. Push the button to the center and hear a click sound, the interface is retracted).