Wireless Microphone System Intelligent Noise Canceling Dynamic UHF Handheld Microphone with LCD Screen for Karaoke Live Broadcasting Item Type: Wireless Microphone System Material: Zinc Alloy Microphone Parameters: Frequency Range: 610.50~669.50MHz Number of Channels: 30 Each for a and B Channels (Conservative Value) ID Code Changes Randomly Each Time It Is Paired, Within the Frequency Range Set by the Manufacturer Oscillation Mode: DSP Chip Frequency Lock Frequency Stability: ±10ppm RF Power: 10dBm Sound Frequency Response: 40~18000Hz Distortion: ≤ 0.5% Battery: Two AA Batteries (Not Included) Receiver Parameters: Frequency Range: 610.50~669.50MHz Number of Channels: A, B Channel Each 30 (Guard Value) Each Time the Pairing, ID Code Randomly Change, In the Frequency Range Set by the Manufacturer. Oscillation Mode: DSP Chip Frequency Lock Rate Stability: ±10ppm Receiving Sensitivity: -95~-71dBm Sound Frequency Response: 40~18000Hz Distortion Rate: ≤0.5% SNR: ≥90dB Sound Output: 350mv(Maximum) Battery Type: Lithium Battery Battery Capacity: 1200mAh (Included)