Built-in, USB rechargeable lithium-ion battery provides 16 hours of uninterrupted listening. And when the battery dies, the included aux cable allows for passive listening
Listen all day, charge at night. The built-in rechargeable Li-ion battery powers the E40 for a generous, best-in-class 16-hours of play time. And on the occasion that you find yourself without power, use the included 3.5mm aux cable to play passively. Also included, a micro USB cord for recharging.