Features: High Resolution 24-bit/48kbps audio. Broad 20Hz-20KHz frequency response. Dynamic Rang 110 dB. Wireless system aims- to take the complexity and frustration, out of traditional wireless microphone systems. Creating a flexible, all-in-one solution that makes any your favorite microphones into wireless,ensures good performance for your every show. Works with any dynamic microphone, Audio mixer, PA system, Provides stable and reliable wireless transmission. The built-in lithium battery provides 10 Hours of battery last longer and a stable wireless technology. Package Includes: 1x Wireless Microphone System Specifications: Material: metal Size: approx 10.5x2x3cm/4.1x0.8x1.2in 2.4ghz channels are available worldwide Mic/Line mode is available 3 ms delay Use a maximum of 20 channels Frequency response range 20HZ-20khz 10 hours battery life, built-in lithium battery when charging 30 meters service distance Sampling rate 24 - bit / 48 kbpsaudic Sound dynamic is110dB The sex ratio of 110 db note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.