A two-way radio may be a radio which will both transmit and receive radio waves (a transceiver), unlike a broadcast receiver which only receives content. it’s an audio (sound) transceiver, a transmitter and receiver in one unit, used for bidirectional person-to-person speech with other users with similar radios. Two-way radios are available in stationary (base station), mobile (installed in vehicles), and hand-held portable models. Hand-held two-way radios are often called walkie-talkies, handie-talkies or hand-helds
Two-way radio systems usually use one radio channel and operate during a half-duplex mode: just one user on the channel can transmit at a time, so users during a user group must alternate talking.
A hand held metal detector is an musical instrument that detects the presence of metal nearby. Metal detectors are useful for locating metal inclusions hidden within objects, or metal objects buried underground.
A detector is an instrument which detects the presence of metal. Metal detectors are useful for locating metal hidden within objects, or metal objects buried underground.
A breathalyzer is an device for measuring the breath alcohol content from an individual . breath alcohol content are often wont to accurately measure an individual’s blood alcohol content.