International advanced wireless chip and circuit design techniques, support all wireless devices. With FM Function, can search radio station broadcast automatically With Hi-Fi Speaker, to make sure the clear and bright sound Support Micro SD Card,USB Slot,DC 5V Slot The wireless working distance is 10 meters It will close automatically if disconnnect Bluetooth for 30 mins A variety of flashing LED lights with different colors, coolor lights flash follow the melody. Battery: 3.7V 1200mAh Normal Volume Playing Time: 3H Working Distance: 10M Charging: 5V/500mAh BT: V4.2