Recommended for ages 6 and up. Works wirelessly with all Bluetooth-enabled devices such as smartphones or tablets. Thanks to the included microphone, the speaker also supports karaoke. Micro-SD/TF card slot, USB port for connecting a USB stick, and Aux-IN port for connecting audio devices. TWS function: Synchronize two speakers together to enjoy stereo sound. Rechargeable 1200 mAh battery for hours of continuous use.