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 so source from subtle backgro noise, making the overall so smooth and natural.Equipped with multiple ports to connect different devices.Compale with smart TV, set-top box, projector, desktop computer, laptop, tablet, smart phone, etc.Specification:Karaoke box color: Black/Red(optional)BT version: V5.0Chip: DSP8048AEffective distance: 30MMicrophone material: Aluminum alloy+ABSKaraoke box material: ABS+UV+platingMicrophone polar pattern: CardioidKaraoke box port: DC, USB so card, HD input, SPDIF input, 3.5mm audio input/output,Frequency range: 700MHz-780MHzFrequency response: 20Hz-17.5KHzReceiving sensitivity: 99dBm-82dBAudio dynamic range: 100dBTransmitting power :100dBmMicrophone size: 23 * 4 * 2.2cm /9.06 * 1.57 * 0.87inKaraoke box size: 15.5 * 8.5 * 4cm /6.1 * 3.35 * 1.57inKaraoke box weight: 170g/6ozPacking list:2 * Wireless microphone1 * Karaoke box1 * USB cable1 * 3.5mm audio cable1 * 3.5mm to RCA cable1 * Power adapter1 * User manualNote:1.Each wireless microphone needs 2*AA batteries(not inclu).2.The microphone so needs to be generated through an external speaker system. The speaker of TV does not support so output, so users need to configure an external so system.