EMB VHF EMIC1200AR Professional Dual Wireless Rechargeable Microphone System For Stage / DJ / Meeting / Show / Party / Karaoke / Teaching / Presentation SYSTEM: Carrier Frequency Range: VHF220-270Mhz | Stability:  0.005% | Ambient Temperature:-20C ~ +50C | Max Deviation: 25kHz | Dynamic Range: 90dB | S/N Radio: &gt; 90dB | T.H.D: &lt;0.5% | Frequency responese: 60Hz ~ 15kHz | Operating Range: 50m (Ideal Condition) RECEIVER: Receiving mode: Quartz Locked | Sensitivity: 4uV | Image Rejection: over 80 dB | Audio Ouput: 0~300mv/10k Mixer , 0-250mV/10K | Power Requirement: AC 110V/220V, 50Hz | Power Adapter:110-240V, 50Hz TRANSMITTER: Microphone: Dynamic (Hand-Held) | Antenna: Built-in | Modulation: FM | Frequency Stability (+50C ~ -10C): 0.005% (20ppm) | Rate Deviation: 75kHz | T.H.D at 1 kHz: 0.8% | Signal/Noise Ratio: 103 dB | RF Output:  10mW | Current Consumption: 30mA | Battery: 9V Battery  up to 8 Hours