Portable karaoke player for kids The Frozen II, works wirelessly with Bluetooth devices. Two microphones are included to sing like a star with the heroines of Frozen, Anna and Elsa. AUX-IN ports, USB connection, and TF/Micro-SD card (up to 32 GB) allow listening to music from external audio devices. Additionally, there is a headphone jack and a recording function to record yourself while singing.