Passive Voice-Enabled RFID Devices

Radio-Frequency IDentification (RFID) is a technology that provides automatic identification of objects, and relies on storing and remotely retrieving data using devices called RFID tags or transponders. The RFID tag is an object that can be applied to and/or incorporated into a product, animal, or person for the purpose of identification using radio waves. Some tags can even be read from several meters away and beyond the line of sight of the reader. Generally, there are three varieties of RFID tags: passive, active, or semi-passive (also known as battery-assisted). Passive tags require no internal power source, are powered by harvesting energy from various artificial energy sources and/or natural energy sources (such as voice signals, other electromagnetic waves, sunlight, vibrations, or RF noise), and are only active when a reader is nearby to power them; semi-passive and active tags require a power source to function (usually a small battery).