Wireless Mini Home Echo Karaoke Systems. Features: The Volume of Microphone and Background Song Can Be Adjusted Separately by the Backside Knobs. Professional Wireless Microphone System with 2 Microphones, So You Can Enjoy Music with Your Friends. Wireless Design Will Bring You into a World Where You Can Sing Happily and Freely with Your Friends and Families. It Frees Performers from the Messy Cables and Helps Them to Move Unimpeded Without Fear of Tripping over Cables During Performances. This Microphone System is Easy to Use with Multiple Systems and is the Perfect Microphone System for Any Professional or Recreational Events. Specifications: Material: Plastic, Metal. Size: 10*8*1.9cm. Color: Show As Pictures. Frequency: 230MHz-270MHz. Microphone Core Sensitivity: -76 3DB. Transmit Power: 16DBm. Effective Distance:> 20M. Receiver Sensitivity: -105DB. Frequency Response: 50HZ-17KHZ. Signal to Noise Ratio:> 100dBV. Distortion: