Bluetooth is use to exchange information over short distances between select and mobile devices using UHF radio waves from 2.402 GHz to 2.48 GHz in ISM bands, and create a private area (PIN) network. Standard for short-distance wireless technology. .
Bluetooth is manag by the Bluetooth Special Interest Group (SIG), which has more than 35,000 member companies in the telecommunications, computer, networking, and consumer electronics sectors. IEEE has standardiz Bluetooth as IEEE 802..15..1, but does not maintain this standard. The Bluetooth SIG oversees the development of specifications, administers certification programs and maintains trademarks.  Manufacturers must comply with the Bluetooth SIG standard and sell it as a Bluetooth device.  The Privilege Network applies to a technology and is license to certify individual devices. In 2009, Bluetooth IC chips shipp around 920 million units a year. ]
A wireless speaker consists of 3 units, a main speaker unit that combines the speaker itself and an pF receiver, and an zF transmitter unit. The transmitter connects to the audio output of audio devices such as hi-fi devices, televisions, computers, and MP3 players. RCA plugs are generally use to accomplish this. The receiver is locat where the listener wants to make sound, so you can move the wireless speaker freely without using cables. Receiver / speaker units are generally better than speakers at enhancing audio signals. It works with batteries or with alternating current. [two]
The signal frequency range use by wireless speakers is the same as that commonly use by wireless phones: 900 MHz. RF signals can track walls and ceilings / ceilings. Most manufacturers claim that the signal travels 150 to 300 feet (50 to 100 meters). Most wireless speakers have variable transmission channels that can be configure with nearby wireless devices using tuning knots to overcome potential RF interference, such as cordless phones and children’s monitors.
Some wireless speakers use the 2.4 GHz frequency band.
The most basic model only provides 3W output, so you don’t get the sound quality you . larg-size models can have a maximum of 5W and high-end models can have a maximum of 10W or more. [Appointment necessary]
The number of speakers also varies. The entry-level model is limit to a single speaker, but the much larger model can provide two speakers, so it has steroidal sound output. Some wireless speakers add a passive radiator to increase low-frequency output for louder sound. 
The latest models typically use Bluetooth 4.0 or Bluetooth 5, and wireless speakers are typically up to 10 meters in size. [Citation near] Bluetooth devices use wireless frequency because they are invisible to anyone.
Some speakers may use an NFC system to facilitate pairing with resource tools. [Appointment necessary]
Wireless speakers use a rechargeable battery as their power source. Speakers typically run for 6 hours before charging. Models with very strong batteries can last up to 10 hours or more. Almost all wireless speakers are power by non-replaceable rechargeable batteries, so the era of these speakers is batteries.
To charge the charger, you to connect the wireless speaker to a power source with a micro USB cable.  The full charge period is typically 3 to 6 hours.
SoundLang Mobile was launch in 2011 as a small battery power model.   Communicate with the source device using Bluetooth. ] Viewers then praise the audio quality of this unit, but criticiz its high price and lack.
of love.ever soundf bluetooth.Are conect with mobile phone and give a goood quilty off sound. at the end of topick i am going to ask you thanks.