Use the 6 voice changing effects and 3 sound effects for endless fun. All New Duets feature lets you add a second microphone. Instant wireless connection to FM tuner via AUX cord. Lead vocal cancellation. Uses Bluetooth to stream audio from karaoke app. Built-in long lasting rechargeable battery for up to 6 hours. High-fidelity dynamic mic with independent volume. Fun lighting effects sync with your music. Dimensions: 2.1"W x 3.6"L x 10.6"H. Includes: Reusable carrying case. Micro USB charging cable. Extra-long AUX cord.