weak radio waves; low-power transmission
Technical term used in radio engineering, telecommunications, and regulations. Refers to signals or transmissions of very low power.
A license may not be required for transmitting weak radio waves.
This device communicates using low-power radio signals.
Compound of 微弱 (weak, faint) and 電波 (radio waves). The exact historical derivation is uncertain, but the term is straightforwardly formed from its components.