Zoook Rocker Thunder 20 watts Bluetooth Speaker with Karaoke Mic/TF/FM/LED/USB/Party Speaker Zoook has upped its game again with the new rocker thunder. Rocker thunder brings together style, creativity and function. This portable sound machi is perfect for those summer time beach days. With the built-in Bluetooth capability, FM radio, aux-in, mic-in, usb and micro-SD inputs. You can enjoy music anyway want. Don't worry about a power outlet. The built-in rechargeable lithium battery allows you to listen to music for hours. Included microphone gets your karaoke nights started