... 2.Support MP3,MP4,FM radio,USB 3.Rechargeabl li-ion battery 4.Micro SD/TF 5.Christmas gift ... effect, easy to carry. 6. Built-in 800mA battery capacity, play 4-5 hours! Good traveling companion. ... phones, laptops, PCS, and tablet PCS with standard 3.5mm earphone jack -40mm speakers built in, impressive ... quality, compact and utterly portable -Built-in 800mAh battery, a sound standby time, 4 to 5 hours ...