An amplifier is integrated into the device. An audio amplifier takes a small signal and makes it bigger without making any other changes in it which results in better sound, so any sound source can be connected to speakers.
65% have it
9. maximum bluetooth range
The device can connect at a greater distance via bluetooth / infrared to another device.
You can use your voice to control key functions of the device and you can easily access your device without pushing any button.
2% have it
23. has active noise canceling / noise reduction
This type of device allows you to listen at lower volume levels, causing less ear fatigue as you don't have to crank up the volume to overcome background noise. Ideal for plane rides and morning commutes.