Feature: 1. Adopt BT 5.0 technology, fast wireless audio transmission speed, low loss. 2. Built-in high performance professional digital audio processing chip, stable current frequency, clear and noiseless. 3. The cardioid microphone effectively isolates the sound source from subtle background noise, making the overall sound smooth and natural. 4. Equipped with multiple ports to connect different devices. 5. Compatible with smart TV, set-top box, projector, desktop computer, laptop, tablet, smart phone, etc. Specification: Item Type: Karaoke SetKaraoke box color: Black BT version: V5.0 Chip: 8048A Effective distance: 30M Microphone material: Aluminum alloy+ABS Karaoke box material: ABS+UV+plating Microphone pattern: Cardioid Karaoke box port: USB sound card, HD input, SPDIF input, 3.5mm input/output, Frequency range: 750MHz-769MHz Frequency response: 20Hz-17.5KHz Receiving sensitivity: 99dBm-82dB D ynamic range: ≥100dB Transmitting power :≥100dBm Microphone size: 23 x 4 x 2.2cm /9.06 x 1.57 x 0.87in Karaoke box size: 15.5 x 8.5 x 4cm /6.1 x 3.35 x 1.57in Karaoke box weight: 170g/6oz . Package List: 2 x Wireless Microphone 1 x Karaoke Box 1 x USB Cable 1 x 3.5mm Sound Cable 1 x 3.5mm Cable 1 x Power Adapter 1 x User Manual Note: 1. Each wireless microphone needs 2xAA batteries(not included). 2. The microphone sound needs to be generated through an external speaker system. The speaker of TV does not support sound output, so users need to configure an external sound system.