Sound bar power is measured in watts and more watts should mean better sound quality. Wattage ranges from around 80W to 300W, with lower power ideal for improving every day TV and higher power offering the very best sound.
A sound bar should match the size of your TV. A smaller sound bar isn't likely to do a wide TV justice, while a large sound bar and small TV is an equally poor pairing. Choosing a sound bar that is similar in size to your TV means you are more likely to hit the sound sweet spot.
Wired or wireless
Most sound bars will connect to a TV wirelessly, as long as the TV is Bluetooth is compatible. You can wire a sound bar to your TV with a HDMI cable, and this is a great way to ensure consistently strong audio.
Most sound bars will come with a remote control for changing songs, volume and more. Some may even let you use your phone as the remote, using Wi-Fi or NFC connection.