Microphone wireless transmission system, Turn wired into wireless, plug and play/free conversion. Powerful functions and multiple , Bring you a comfortable experience, accompany you every time you sing. /5V/48V three modes to meet your needs, Built-in 0V /5V/48V three modes switch. Long-lasting battery life, and large capacity battery, Can be powered by USB data and can be used for about 7 hours after fully . 48KHz sampling rate, high-fidelity sound restoration, Accurately restore every detail of the sound, enjoy beautiful music. Built-in dual antenna 38 meters long-distance transmission, Signal transmission is more stable and faster, wireless audio HD transmission distance can reach 38 meters. Intelligent compatibility, simple operation and easy to use, Advanced technical support determines that it is not only for the stage the trouble of wire constraints, suitable for a variety of scenarios, Suitable for concerts, outdoor singing, recording studios and more occasions. Battery specifications:built-in 1100 mAh Use time:7 hours Number of channels:20 Channel range:600-690MHZ FM mode:UHF FM Use distance:38 meters Dynamic range:110dB Sampling rate:24-bit Sound to noise ratio:110dB Type:One to Two Colour:As Shown Material:Plastic Package Contents: 1 * receiver 2 * Transmitter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.