This microphone combined both wired and wireless functions. Wireless let you singing free of dragging cord. Wired let you singing without the concern of battery power off. You can use this for speeches, lectures, meetings, karaoke, music performances or anything else.Easy operation and convenient use. You will love it! Buy it today! You can t miss it. Feature: 100% brand new and high quality 2in1 Wired & Wireless functions Wireless let you singing free of dragging cord Wired let you singing without the concern of battery power off Specifications: The length of the Microphone Cord:2.5m Package weight:9.3 oz/263g Microphone sensitivity: -54dB±3dB(0dB=1V/Pa) Directivity: Un-directional Frequency response: 100Hz-10,000Hz Out put impedance: 600ohm Operating voltage: DC 1.5V Working distance: 8-20m Impedance:600 ohm S/N ration: 60dB Reception sensitivity:30dB/uV Products using the power: 1X AA Battery (Not include battery) How to use: Easy operation Wired: Make sure the battery is not in the Microphone. And plug the cord to the microphone and your audio amplifier. Switch microphone to MIC position, and start to sing. Wireless: Install batteries into both microphone and receiver. Switch on them, the connection will be built easily. With LED indicator. Switch microphone to ON position, and start to sing. Switch microphone to MIC position when you need a short break. It won't collect other voices to the microphone. If it does not work normal. Use a screw to press the RESET hole on the receiver. If you don't use it for long time. Please take batteries out to protect the microphone's components. Package Content: 1X Microphone (NO Retail Box. Packed Safely in Bubble Bag) 1X Microphone Wireless Receiver 1X Microphone Wireless antenna 1X Microphone Cord 1X User Manual