Finger-mounted device with sensors and haptics

A finger-mounted electronic device, comprising:

• a body configured to wrap around an entire circumference of a finger;
• an accelerometer in the body and configured to detect a three-dimensional air gesture with which display content on a head-mounted device is manipulated;
• a force sensor in the body and configured to detect a finger tap with which the display content on the head-mounted device is selected, wherein the force sensor is configured to measure a force applied by the finger on the force sensor as the finger is compressed;
• and
• a visual marker on the body with which the head-mounted device tracks a location of the finger-mounted electronic device, wherein the display content displayed by the head-mounted device is moved based at least partly on the tracked location of the finger-mounted electronic device.

A system, comprising:

• a finger-mounted electronic device having a first force sensor and a first accelerometer;
• a hand-worn electronic device having a second force sensor and a second accelerometer;
• and
• a head-mounted device having a display configured to display virtual reality content, wherein the virtual reality content is selected using force input detected by the first and second force sensors and is moved using air gesture input detected by the first and second accelerometers.