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.
63% have it
Soundmatters FoxL DASH7: 19mm
Meridian Explorer 2: 58.75cm³
Scosche boomBOTTLE mini: 34.5mm
5. has a rechargeable battery
The battery can be recharged and used over again.
64% have it
Meridian Explorer 2: 50g
7. has a socket for a 3.5 mm audio jack
With a standard mini jack socket, you can use the device with most headphones.
43% have it
8. USB ports
With more USB ports, you are able to connect more devices.
JBL Boombox: 2
9. travel bag is included
The device comes with its own special case or pouch, which is useful for safe transportation.
16% have it
10. number of microphones
More microphones result in better sound quality and enable the device to filter out background noise.