Logitech Harmony One User Manual page 38

Tuner
Power strip
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Also referred to as a receiver or a stereo receiver. A tuner is any
component that receives or tunes, broadcast signals, or AM/FM
radio.
Typically refers to the single component that includes a
preamplifier, surround processor, multi-channel amplifier, and
AM/FM tuner.
A common device that acts like an extension cord, providing
additional cord length, as well as a mechanism that offers
several electrical outlets.