An expandable device adapted to be removably coupled to a platform for attaching to a portable electronic device or a case for a portable electronic device includes a body, a button, and a locking device. The body has a first end, a second end, and a longitudinal axis, and is movable along the longitudinal axis between an expanded configuration and a collapsed configuration. The button is coupled to the first end of the body, and includes an inner surface and an engaging member carried by the inner surface. The locking device is carried by the second end of the body, at least a portion of the locking device being adapted to be removably coupled to the platform for attaching to the portable electronic device or the case for the portable electronic device. When the body is in the collapsed configuration, the engaging member of the button engages the locking device such that the button and the locking device can be rotatable together.