Wireless Bluetooth speaker with built-in microSD card reader, USB port for connecting an external device, and AUX input. Technical Specification: power supply: built-in 1000mAh battery 2 microphone inputs Jack 6.3mm power: 2 tweeters 3W + bass speaker 5W AUX input miniJack 3.5mm microSD card reader USB slot for connecting a flash drive included microUSB cable for charging dimensions: 37.5x15.5x15cm shoulder strap included number of pieces. in carton: 20