Features: Adopt BT 5.0 technology, fast wireless audio transmission speed, low loss. Built-in high performance professional digital audio processing chip, stable current frequency, clear and noiseless. The cardioid microphone effectively isolates the sound source from subtle background noise, making the overall sound smooth and natural. Equipped with multiple ports to connect different devices. Compatible with smart TV, set- box, projector, desktop computer, laptop, tablet, smart phone, etc. Specification: Karaoke box color: BlackRed(optional) BT version: V5.0 Chip: DSP8048A Effective distance: 30M Microphone material: Aluminum alloy+ABS Karaoke box material: ABS++plating Microphone polar pattern: Cardioid Karaoke box port: DC, USB sound , HD input, SPDIF input, 3.5mm audio inputoutput, Frequency : -780MHz Frequency response: 20Hz-17.5KHz Receiving sensitivity: 99dBm-82dB Audio dynamic : ≥100dB Transmitting power :≥100dBm Microphone size: 23 * 4 * 2.2cm /9.06 * 1.57 * 0.87in Karaoke box size: 15.5 * 8.5 * 4cm /6.1 * 3.35 * 1.57in Karaoke box weight: 170g6oz Packing list: 2 * Wireless microphone 1 * Karaoke box 1 * USB cable 1 * 3.5mm audio cable 1 * 3.5mm to RCA cable 1 * Power adapter 1 * User manual Note: 1.Each wireless microphone needs 2*AA 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 .