Speakers Cum Headphones: Just flip these to transform from headphones to speakers and vice versa. Hence, they are super versatile/BoostedBass Technology: With 40mm drivers and deep bass, it is meant to level up your sound experience/Massive Playtime: Enjoy music and call time for as long as 8 hours as headphones and 6 hours as speakers, these come with a durable 400mAh battery.