1、Built-in high performance professional digital audio processing chip, provide clear noise and stable current frequency. 2、U segment high‑frequency transmitter chip, 20m ultra‑long range, support fiber optic high‑definition digital audio signal decoding. 3、Bluetooth 5.0 high rate low loss wireless audio transmission, retain 3.5 audio input port, ensure the traditional way of audio input. 4、Support USB sound card/Bluetooth 5.0/High-Definition Multimedia Interface (ARC) input/optical fiber input /3.5 audio input interfaces, compatible with TV/set‑top box/computer/smart phone/tablet and other devices. 5、Adopt for DSP audio processing chip, ensure the sound quality, provide better using experience. Item Type: Wireless Microphone Material: Aluminum Alloy+Plastic Weight: Approx. 872g/ 30.8oz K8 Port: Bluetooth 5.0, fiber input, USB sound card, 3.5 audio input, coaxial input Chip: DSP8048A Frequency: 50-60 hz Pickup: low noise moving coil Microphone Type: wireless Frequency Modulation Mode: FM/VHF Frequency: 700 MHz to 780 MHz Microphone Core Sensitivity: -76±3dB Transmission Power: ≥100dBm Effective Distance: > 20m Receiving Sensitivity: 99dBm-82dB Frequency Response: 20Hz - 17.5KHz SNR:＞100dBV Distortion:＜0.3% Audio Dynamic Range: ≥100dB USB Interface Type: Mini USB USB audio ports connect to for Android boxes, computers and smart TVs Microphone Battery: 2PCS AA Batteries Each Microphone(excluding) System Requirements: for Android 4.1 or higher Product Support: optical fiber, Bluetooth, USB sound card, coaxial, line and other 5 modes of input, support line output Instructions: TV connection method 1. The TV is connected to the karaoke magic box, and the corresponding audio cable can be selected in any way (wireless Bluetooth, USB sound card, coaxial, optical fiber input, audio input) 2. Independent audio connection K magic box, 3.5mm audio cable can be used to connect Connection method of set top box 1. The TV is connected to the karaoke magic box, and the corresponding audio cable can be selected in any way (wireless Bluetooth, USB sound card, coaxial, optical fiber input, audio input) 2. Independent audio is connected to the karaoke magic box, using 3.5mm audio cable 1 x K8 Home Wireless Karaoke Box 2 x Wireless Microphone (not Including 2PCS 1.5V AA Batteries). 1 x Usb Sound Card Cable 1 x Coaxial Line 1 x Power Adapter 1 x 3.5mm Audio Cable 1 x 3.5mm to 2RCA Interface Audio Cable 1 x Instruction