Built-in Bluetooth wireless transmission、 telephone hands-free functionStereo audio transmission protocol (A2DP V1.2)Support MP3 songs play U disk storageSupport MP3 songs played TF card storeSupport all external terminal 3.5 mm audio inputSupport FM channel automaticallySupport can be charging circuit Transfer Distance: <10mPower Output: 3w x 1Input sensitivity: 400mvS/N: >80dBDegrees of separation: 90 db or higherVoltage: DC 5VPackage Inculded:1 x Bluetooth speaker