Features: Wireless UHF System: The UHF system includes handheld microphone and one receiver, featuring 16 channels and long distance operation, with LED screen to display transmitter parameters.  Dynamic Handheld Microphones: Portable handheld microphone features dynamic pickup, total 26.5cm/10.4inch length makes it comfortable to hold, widely suitable for broadcast, interview, church and more.  6.35mm Plug Receiver: The receiver with 6.35mm plug can be applicable for speaker, audio mixer and DVD player, 3.5mm audio adapter(Not included) is necessary for camera connection.  Battery Powered: The handheld microphone is powered with 2pcs AA batteries, the receiver is powered by a 18650 battery and can be recharged with USB cable included.(Batteries Not Included).  Wide Application: The headset microphone system can be widely applicable for video recording, broadcast, interview, online teaching and more occasions.   Specifications: Model: AD-231;  Transmission Range: 30-50 meters;   --Technical Specifications: Frequency Range: 630-690MHz;  Frequency Channel: 16 channels;  Oscillation Mode: DSP chip frequency lock;  Frequency Stability: ±10ppm;  Frequency Power: 10dBm;  Frequency Response: 40-18kHz;  Distortion: ≤0.5%;  Power Supply: 2pcs 1.5V AA batteries(Not included);  Working Time: 4-8 hours;   --Receiver Specifications: Frequency Channel: 16 channels;  Oscillation Mode: DSP chip frequency lock;  Frequency Stability: ±10ppm;  Receiving Sensitivity: -95~-71dBm;  Frequency Response: 40-18kHz;  Signal to Noise Ratio: ≥90dB;  Audio Output: Max.300mV;  Power Supply: 1pc 18650 lithium battery(Not included);   Package Size: 30 * 12.5 * 6cm / 11.81 * 4.92 * 2.36in;  Package Weight: 450g / 15.87oz;   Packing List: 1 * Handheld Microphone;  1 * Receiver;  1 * Microphone Silicone Ring;  1 * USB Charging Cable;  1 * User Manual