Lenco BTT-2 - Manual (Page 30)

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USB port : USB (Universal Serial Bus) is a standard for connecting peripherals to
computers or other equipment.
Flash memory : Flash memory is a non-volatile form of external memory. This
technique makes It possible to write or erase in several parts of the memory using a
single programming operation. Flash memory is non-volatile memory: it retains data
when power is turned off.
SD Card : A Secure Digital card (SD Card) is a memory card that is built from flash
memory.
AUX in : Auxiliary in. An input on an audio device that allows connecting an external
device.
Fail situation : A situation in which the device does not respond or operate as
intended. For instance when buttons do not respond or smoke starts coming out of
the device.
Mono : Mono means one and in sound engineering the term is used to indicate that
all sound is distributed and output through a single channel.
Stereo : Stereo generally refers to two-channel sound recording and/or output: a
recording that contains a simultaneous signal for two speakers, as opposed to
monaural sound which one contains one channel. Humans naturally hear stereo
sound. With two ears humans can process two different signals (left and right) and
because of this, the human brain can get a certain degree of spaciousness in the
sound perception. This is stereo.
Input source : These are the various connectivity options that the device offers for
external equipment.