Electronic system with ring device

A ring device, comprising:

• a ring-shaped housing configured to be worn on a finger;
• sensors mounted in the ring-shaped housing, wherein the sensors include a motion sensor and at least one of a temperature sensor, an ambient light sensor, and a health sensor;
• and
• a near-field communications reader configured to obtain tag information from a near-field communications tag in response to information from the motion sensor.

A ring device, comprising:

• a sensor configured to detect gesture input in a virtual reality environment;
• and
• wireless communications circuitry configured to send control signals to an electronic device based on the gesture input, wherein the wireless communications circuitry comprises near-field communications circuitry selected from the group consisting of:
• a near-field communications tag reader and a near-field communications tag emulator.