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Frequency - A measure of the energy, as one or more waves per second, in an electrical or light wave information signal. A signal's frequency is stated in either cycles-per-second or Hertz (Hz).

Handset - Any handheld device used to transmit and receive calls from a wireless system. Also known as a wireless phone, a cellular phone, a mobile phone, or a PCS phone.

Infrared - A wavelength used to transmit data. Many mobile phones and computers have infrared ports, enabling data to be shared between two devices without wires.

Local Calling Area - The region across which the call is truly local, involving no toll charges.

SMPTE - "Society of Motion Picture and Television Engineers." A professional organization that is responsible for the standards for film and television production.

Time Lapse - Records a single frame of video footage at preset time intervals. This feature compresses the time of slow moving objects. When video is played back, events that take minutes or hours to unfold in normal time are compressed to seconds.

Woofer - A loudspeaker used for reproducing bass frequencies.