Features: 1. 100% and 2. Adopt UHF technology remote wireless transmission makes easier without annoying wires it can achieve 20m of the transmission distance. Broader frequency range less interference showing your voice easily and perfectly 3. Adopt the exacting complete electronic circuit control rich full-bodied sound from sources that are directly in front of the microphone. 4. Can with 3.5mm and 6.35mm female interface devices. 5. Suitable for all events like Karaoke live-performances conference school hall party etc. Specification: Condition: 100% Material: Plastic Input: 2.2-3 V Operating Current: 90 mA Max Working Frequency: 261.80 Mhz Fixed Pattern: Heart-Shaped Polarity Pattern Sensitivity: -50 +/- 3dB THD: Less Than 0.7% S / N: Over 110dB Delay Time: Less Than 5 Milliseconds Frequency Response: 50Hz~18khz Power: 2 AA Batteries not included Working Temperature: -10-50℃ Color: Black Package Size: Approx. 25 * 7.8 * 5.7cm / 9.8 * 3.1 * 2.2in Package List: 1 * Microphone 1* USB Receiver 1 * Audio Cable