Ecsem Wireless Multifunction Stereo HiFi MP3 Music Bluetooth headset with 400 Hours StandBy time/30 Hours Working Time HIFI Level Stereo Sound Effect, providing you the strongest sound effect that you ever heard before; Foldable fashion design, comfortable to wear; Using CVC echo cancellation technology and noise reduction with DSP digital signal processing function; Support Line-In: Can be connected with 3.5mm cable and stream music directly from mobile, computer, tablet Built-in high capacity rechargeable lithium-ion battery allows you continuously for 30 hours music play time or more.