Sony SRS-XB31 review: specs and price

Volume is the quantity of three-dimensional space enclosed by the product's chassis or, in simpler terms, the space the product occupies.

A speaker driver is an individual transducer that converts electrical energy to sound waves. More drivers may result in better sound quality.

There is a control panel on the device body, so you can easily access the volume control or remote without having to interact with a cable or another device it's connected to.

The driver unit is the component that produces sound in the device. Bigger drivers are more powerful and can produce better bass.

The device is protected with extra seals to prevent failures caused by dust, raindrops, and water splashes.

The device is dustproof and water-resistant. Water-resistant devices can resist the penetration of water, such as powerful water jets, but not being submerged into water.

Devices with stereo speakers deliver sound from independent channels on both left and right sides, creating a richer sound and a better experience.

The lowest frequency at which the device produces audio. The lower the low-frequency response, the stronger and juicier the bass.

Devices with a subwoofer have a higher quality, deeper bass.

A passive radiator is a type of driver (speaker) that doesn't have a voice coil and a magnet. The sound vibrations produced by a passive radiator depend on its mass and the size of its enclosure. It is usually used in combination with a woofer to produce deep bass tones.

The highest frequency at which device produces audio. The higher the high-frequency response, the clearer and crispier the treble.

These microphones are designed to filter out background noise from the desired sound. Especially useful in noisy environments.

The battery can be recharged and used over again.

An indicator shows you when the device has low battery.

The device's battery life (when in use) as given by the manufacturer. With a longer battery life you have to charge the device less often.

The time it takes to fully charge the battery.

The manufacturer offers a branded wireless charging kit. To charge the device, you simply put it down on its charging base.

The battery is removable and can be replaced by the user if broken.

An auxiliary input allows you to play other audio sources by connecting them through a simple audio connection like a 3.5mm jack, i.e for MP3 or portable DVD/CD player.

Bluetooth is a wireless technology standard that allows data transfers between devices placed in close proximity, using short-wavelength, ultra-high frequency radio waves. Newer versions provide faster data transfers.

The device can connect to Wi-Fi.

The device can connect at a greater distance via Bluetooth or infrared to another device.

With more USB ports, you are able to connect more devices.

With a standard mini jack socket, you can use the device with most headphones.

Wireless devices allow users more freedom of movement.

This technology allows the users to use their smartphone as a remote control for the device.

A built-in FM radio tuner allows you to listen to most of the live-broadcasted FM radio stations without using the internet.

The device has an option to mute/unmute a conversation directly from the device.

You can use your voice to control key functions of the device and you can easily access your device without pushing any button.

A sleep timer is a function that shuts off the power after a preset amount of time.