Touch Button Wireless Speaker Loudspeaker Phone Audio Mini Portable Speaker AJ-81 Features: Built-in Bluetooth wireless transmission Telephone hands-free function Support stereo Can be charging circuit Double horn design Sound quality more pure thick Support AUX function Support TF card Output power: 3 w * 1 Horn: 4 O 3 w Input sensitivity: 400 mv Degree of separation: 90 db or higher Sgnal-to-noise ratio: 80 db or higher Working voltage: DC 5 v