Abstract: An electronic device is provided for connecting to an external device. The electronic device includes a main body, a connector at a proximal end of the main body, a bottom case coupled to the main body at a distal end, and a top case slidably located opposite to the bottom case. The electronic device further includes a first cantilever locking arm and a second cantilever retaining arm on at least one side of the main body. The top case is slid towards the bottom case to expose the connector and the top case is slid towards the connector to cover the connector. The first cantilever locking arm includes an open locking mechanism and a close locking mechanism for maintaining the top case in an open state and a closed state respectively. The second cantilever retaining arm retains the top case on the main body.