Product Attributes:L:8.7cm/3.4in,W:7cm/2.8,H:8.7cm/3.4in.Support Bluetooth/TF/USB/AUX 4 kinds of connections. This speaker can be used as a KTV or as a separate music player.With compact size, the speaker can be easily carried to any outdoor scene by both adults and toddlers, adding fun to your play! HI-FI 3D Sound: This mini karaoke machine and microphone is equipped with high-performance audio drivers and advanced digital signal processor to maximize the clarity of the sound and retain the texture of the human voice，3D surround technology makes you feel like you're in a live High-Capacity Battery: The speakers and microphone can work continuously for more than 3h and standby for more than 90 days. Automatic shutdown after 5 minutes of no connection and no operation Lighting Effects: There are 7 kinds of lighting effects for you to choose, you can turn on or off the light according to your preference Exquisite Gift: This delicate and compact speaker is a great gift for Christmas, Thanksgiving, Children's Day, Halloween, Mother's Day, Father's Day