Blaupunkt OPAK built for the real world, inside built is solid & tough. The outside has a mesh like material that adds to the look & gives a rugged look. OPAK has dual passive radiators enhance the volume & quality of the sound, so you get better clarity & clearer 24W output right through the volume spectrum. A 2000 mAh powers you through 8 Hrs of playtime. at volumes that are great, so charge it up & keep that beat going on and on. Compact & lightweight with built in mic speakerphone, have con calls with your mates, anywhere. Get everybody to have their says & hear it all. Thanks to the sensitive mic that picks up everything.