<s>
Wireless	B-Device
speakers	I-Device
are	O
loudspeakers	O
that	O
receive	O
audio	O
signals	O
using	O
radio	O
frequency	O
(	O
RF	O
)	O
waves	O
rather	O
than	O
over	O
audio	O
cables	O
.	O
</s>
<s>
The	O
two	O
most	O
popular	O
RF	O
frequencies	O
that	O
support	O
audio	O
transmission	O
to	O
wireless	O
loudspeakers	O
include	O
a	O
variation	O
of	O
WiFi	O
IEEE	O
802.11	O
,	O
while	O
others	O
depend	O
on	O
Bluetooth	B-Protocol
to	O
transmit	O
audio	O
data	O
to	O
the	O
receiving	O
speaker	O
.	O
</s>
<s>
Portable	O
wireless	B-Device
speakers	I-Device
for	O
outdoor	O
use	O
are	O
typically	O
designed	O
for	O
ruggedness	O
,	O
portability	O
and	O
battery	O
life	O
,	O
whereas	O
stationary	O
wireless	B-Device
speakers	I-Device
with	O
a	O
focus	O
on	O
good	O
sound	O
quality	O
are	O
meant	O
to	O
be	O
used	O
in	O
home	O
audio	O
systems	O
or	O
surround	O
sound	O
systems	O
for	O
TV	O
or	O
video	O
.	O
</s>
<s>
Further	O
,	O
types	O
for	O
special	O
applications	O
like	O
waterproof	O
speakers	O
for	O
use	O
in	O
the	O
shower	O
or	O
speakers	O
for	O
a	O
voice	B-Protocol
assistant	I-Protocol
may	O
intermix	O
between	O
the	O
properties	O
of	O
the	O
two	O
former	O
.	O
</s>
<s>
Wireless	B-Device
speakers	I-Device
are	O
composed	O
of	O
two	O
units	O
:	O
a	O
main	O
speaker	O
unit	O
combining	O
the	O
loudspeaker	O
itself	O
with	O
an	O
RF	O
receiver	O
,	O
and	O
an	O
RF	O
transmitter	O
unit	O
.	O
</s>
<s>
An	O
RCA	B-Protocol
plug	I-Protocol
is	O
normally	O
used	O
to	O
achieve	O
this	O
.	O
</s>
<s>
The	O
receiver	O
is	O
positioned	O
where	O
the	O
listener	O
wants	O
the	O
sound	O
to	O
be	O
,	O
providing	O
the	O
freedom	O
to	O
move	O
the	O
wireless	B-Device
speakers	I-Device
around	O
without	O
the	O
need	O
of	O
using	O
cables	O
.	O
</s>
<s>
The	O
signal	O
frequency	O
range	O
used	O
by	O
wireless	B-Device
speakers	I-Device
is	O
generally	O
the	O
same	O
as	O
that	O
used	O
by	O
cordless	O
telephones	O
–	O
900MHz	O
.	O
</s>
<s>
Many	O
wireless	B-Device
speakers	I-Device
feature	O
variable	O
transmission	O
channels	O
that	O
can	O
be	O
set	O
using	O
a	O
tuning	O
knob	O
to	O
overcome	O
potential	O
RF	O
interference	O
with	O
other	O
nearby	O
wireless	O
devices	O
,	O
such	O
as	O
cordless	O
phones	O
or	O
baby	O
monitors	O
.	O
</s>
<s>
Some	O
wireless	B-Device
speakers	I-Device
use	O
the	O
2.4GHz	O
frequency	O
band	O
.	O
</s>
<s>
Some	O
wireless	B-Device
speakers	I-Device
add	O
a	O
passive	B-Architecture
radiator	I-Architecture
to	O
improve	O
low	B-Algorithm
frequency	I-Algorithm
reproduction	O
and	O
achieve	O
deeper	O
sound	O
.	O
</s>
<s>
Recent	O
models	O
generally	O
use	O
Bluetooth	B-Protocol
4.0	O
or	O
even	O
Bluetooth	B-Protocol
5	O
,	O
and	O
wireless	B-Device
speakers	I-Device
generally	O
have	O
a	O
range	O
of	O
10	O
meters	O
.	O
</s>
<s>
Bluetooth	B-Protocol
devices	O
use	O
a	O
radio	O
communication	O
frequency	O
such	O
that	O
the	O
devices	O
do	O
not	O
have	O
to	O
be	O
in	O
a	O
visual	O
line	O
of	O
sight	O
with	O
each	O
other	O
.	O
</s>
<s>
Wireless	B-Device
speakers	I-Device
use	O
rechargeable	O
batteries	O
to	O
power	O
them	O
.	O
</s>
<s>
Almost	O
all	O
wireless	B-Device
speakers	I-Device
operate	O
on	O
rechargeable	O
batteries	O
that	O
are	O
not	O
replaceable	O
,	O
so	O
that	O
the	O
lifespan	O
of	O
these	O
speakers	O
is	O
that	O
of	O
their	O
batteries	O
.	O
</s>
<s>
Other	O
speakers	O
utilize	O
proprietary	O
connectors	O
such	O
as	O
Apple	O
's	O
Lightning	B-Architecture
connector	I-Architecture
.	O
</s>
<s>
Starting	O
2015	O
,	O
some	O
wireless	B-Device
speakers	I-Device
integrate	O
VOIP	O
telephony	O
functions	O
.	O
</s>
<s>
The	O
higher	O
end	O
models	O
add	O
an	O
LCD	B-Device
screen	I-Device
to	O
make	O
it	O
easier	O
to	O
select	O
and	O
store	O
radio	O
stations	O
.	O
</s>
<s>
Most	O
wireless	B-Device
speakers	I-Device
have	O
a	O
built-in	O
microphone	B-Application
,	O
which	O
allows	O
to	O
receive	O
and	O
make	O
calls	O
using	O
a	O
mobile	O
phone	O
in	O
hands-free	O
mode	O
.	O
</s>
<s>
With	O
the	O
development	O
of	O
voice	B-Protocol
assistants	I-Protocol
,	O
manufacturers	O
have	O
integrated	O
the	O
ability	O
to	O
pair	O
them	O
with	O
their	O
devices	O
.	O
</s>
<s>
This	O
way	O
,	O
commands	O
can	O
be	O
passed	O
to	O
the	O
speaker	O
via	O
the	O
integrated	B-Application
microphone	I-Application
,	O
which	O
will	O
then	O
be	O
executed	O
by	O
the	O
voice	B-Protocol
assistant	I-Protocol
.	O
</s>
<s>
A	O
shower	B-Device
speaker	I-Device
is	O
a	O
Bluetooth	B-Protocol
speaker	O
designed	O
for	O
use	O
in	O
humid	O
environments	O
such	O
as	O
showers	O
or	O
more	O
generally	O
in	O
the	O
bathroom	O
.	O
</s>
<s>
There	O
are	O
also	O
shower	B-Device
speakers	I-Device
using	O
Wi-Fi	O
,	O
although	O
this	O
is	O
more	O
rare	O
.	O
</s>
<s>
The	O
speaker	O
must	O
first	O
be	O
paired	O
with	O
a	O
Bluetooth	B-Protocol
device	O
.	O
</s>
<s>
A	O
shower	B-Device
speaker	I-Device
must	O
first	O
of	O
all	O
be	O
able	O
to	O
withstand	O
water	O
splashes	O
.	O
</s>
<s>
The	O
shower	B-Device
speaker	I-Device
must	O
be	O
able	O
to	O
be	O
installed	O
in	O
all	O
environments	O
.	O
</s>
