The invention is directed towards a wearable platform system (e.g., head-mounted computing device) that allows for various modular peripheral devices to be interchangeably attached and detached, as well as methods and systems for transitioning an operational mode of the wearable platform between a hard connection mode and a wireless connection mode when a peripheral device is attached to or removed from the wearable platform. Specifically, the wearable platform may include a base member coupled to one or more arm members. A variety of modular peripheral devices may be attached at a hardware interface of the wearable platform to provide varied functionality to the wearable platform. As a user begins to remove a peripheral device, the wearable platform system may determine the peripheral device is being removed from the wearable platform and may transition from a hard connection mode to a wireless connection mode.