Satechi iTour-Pop 3.5mm Aux Portable Rechargeable Speaker (Black) for iPhone, iPad, iPod Touch, Samsung Galaxy Tab/S7/S7 Edge/Note/Nexus, HTC One M9/M8, LG G4, Lumia 950, OnePlus and more Performance ultra portable 3.8W speaker for portable audio sources such as mobile phones, iPod, netbook/notebook/macbook Integrated Class-D amplifier for excellent acoustic performance (360 sound field) Integrated Li-Ion-battery (USB chargeable) for max 6 hours playtime Pop-in/-out-mechanic: Pushing upper and lower part together can further reduce its size even further to fit in any pocket. The extended mode will guarantee best sound performance due to increased body volume. Compatible with any audio device with a 3.5mm audio port