A wearable device and methods for using the same provided. In one embodiment, a wearable device includes a pair of earphones with a controller and an expansion pack. The controller includes a first set of electrical contacts and a first set of modules. The expansion pack includes a second set of electrical contacts and a second set of modules. The controller is configured to electrically couple at least one module of the first set of modules to at least one module of the second set of modules when the controller is electrically coupled to the expansion pack. The expansion pack may further include a USB energy storage device to provide the earphones with an extended battery life when the expansion pack is coupled to the chargeable batteries of the controller.