3-Stage Push-Pull DesignWID 10 usb flash drive 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 interface and solves the problem of the cover being easily lost or damaged. (Note! When you push and pull the button of the external drive, you will hear a “click” sound, and the interface is fixed.)