Features: FM Radio Function ( Please note that if the FM Signal is not so good, then plug the 3.5mm cable and the USB cable and make sure the signal of the setting place is good ) Up to 8 hours of music/talking time. Recharge in just 3-4 hours with the Micro USB cable. Built-in Microphone for Hands-free calling micro-SD Card(up to 16G) Slot and U Disk slot Allows Music Playback From Various Source. Compatible with all Bluetooth-enabled devices,Also built-in 3.5 AUX port is friendly for non-Bluetooth devices.Specifications: Bluetooth Version:3.0 Frequency Range:100HZ-20KHZ Effective Range: Up to 33ft Power Rating: 6W SNR: no less than 85dB?¨¤2db Battery Capacity: 1500mAh Charging Voltage: DC5V Charge Time: Approx. 4 hours Package Contents: 1x Super Bass Bluetooth Speaker 1x USB Charging Cable 1x Audio Cable 1x User Manual Note: Usually, the language is English. If yours' was Chinese, please press the paly buttons for 6-8 times, then it will be successfully changed.