MUSIC ANGEL &reg; Portable Wireless Bluetooth Speaker 4.0 Technology 11 Hours Playtime with TF Card Function Diaphragm Dual Speakers for Indoor/Outdoor/Shower Usage Incredible sound quality.Two highly powerful total 8W acoustic drivers that deliver crystal clear deep bass Stylish design & Ultra-light weight Build-in 2200mAh 18650 battery can be played for more than 11 hours. Built-in microphone for hands-free speaker phone calling. Easy to pair Advanced Bluetooth 4.0 Technology, power-conserving, low power consumption With TF card function, to download any music you like via connect with computer