The disclosure provides wearable devices, comprising a ring-shaped body, input devices, and output devices, designed for users, including users with one or more disabilities. The disclosure also provides systems for wireless control of receiver devices, comprising wearable devices, removable power storage systems, charging stations, and receiver devices or smart receiver devices. Wearable devices of the present disclosure are configured to be modular and interchangeable, and systems of the present disclosure are extensible to the internet and smart devices without requiring rewiring of preexisting devices. Also provided herein are methods of using such wearable devices, receiver devices, smart receiver devices, and systems.

Systems, methods, and articles for a portable power case are disclosed. The portable power case is comprised of at least one battery and at least one PCB. The portable power case is operable to supply power to a transceiver. The portable power case is operable to be charged using a DC power source (e.g., solar panel, wind turbine, water turbine). A plurality of portable power cases, DC power sources, and transceivers are operable to form a mesh network.

This application relates to a cordless power tool system including a set of cordless power tools, a set of rechargeable and removable battery packs, and a set of battery pack chargers.