Wireless speakers are composed of two units: a main speaker unit combining the loudspeaker itself with an RF receiver, and an RF transmitter unit. The transmitter connects to the audio output of any audio devices such as hi-fi equipment, televisions, computers, MP3 players, etc. An RCA plug is normally used to achieve this. The receiver is positioned where the listener wants the sound to be, providing the freedom to move the wireless speakers around without the need of using cables. The receiver/speaker unit generally contains an amplifier to boost the audio signal to the loudspeaker; it is powered either by batteries or by an AC electric outlet

The signal frequency range used by wireless speakers is generally the same as that used by cordless telephones – 900 MHz. The RF signal can traverse walls and floors/ceilings. Most manufacturers claim the signal transmits over a range of 150 to 300 feet (50 to 100 m). Many wireless speakers feature variable transmission channels that can be set using a tuning knob to overcome potential RF interference with other nearby wireless devices, such as cordless phones or baby monitors.

Some wireless speakers use the 2.4 GHz frequency band.

Sound quality

The most basic models only offer an output power of 3W, which does not allow for an optimal sound quality. Mid-range models go up to 5W and high-end models can go up to 10W and beyond.^{[citation needed]}

The number of speakers can also vary: while entry-level models are limited to a single speaker, more elaborate models can offer two, and thus have stereo sound reproduction. Some wireless speakers add a passive radiator to improve low frequency reproduction and achieve deeper sound.

Bluetooth

Recent models generally use Bluetooth 4.0 or even Bluetooth 5, and wireless speakers generally have a range of 10 meters.^{[citation needed]} Bluetooth devices use a radio communication frequency such that the devices do not have to be in a visual line of sight with each other.

Some speakers may benefit from the NFC system to facilitate pairing with the source device

Battery

Wireless speakers use rechargeable batteries to power them. The operating time of the speaker before it has to be recharged is usually 6 hours. Models with more powerful batteries can last up to 10 hours or more. Almost all wireless speakers operate on rechargeable batteries that are not replaceable, so that the lifespan of these speakers is that of their batteries. Some speaker models with a large battery capacity can also act as a power bank to charge another device to full capacity, such as a mobile phone.

They are generally recharged with either a C8 appliance plug or a more universal USB connector, mainly through either mini or micro-USB or USB-C connectors. Other speakers utilize proprietary connectors such as Apple’s Lightning connector. The complete charging cycle a speaker generally varies from 3 to 6 hours.

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