Specifications: Color: Black Number of channels: 20 Distance: Transmission distance is about 30 meters Battery life: 6 hours Power supply: built-in USB charging Delay: about 5ms Sampling rate: 24bt48 kpbs Audio Frequency response range: 20Hz-20kHz Antenna impedance: 50? Sex to noise ratio: 110dB Support microphone types: dynamic microphone and condenser microphone with built-in power supply Feature: 1. High-quality Sound Transmission: 24-bit audio resolution, sampling frequency of 48K, providing stable and reliable wireless transmission. The delay is less than 6ms, no delay or no signal loss. Make sure you get good performance every time. 2. Designed for Dynamic Microphones: The transmitter and receiver are suitable for any dynamic microphone, mixer, PA system. Provide stable and reliable wireless transmission. Make sure you get good performance every time. Without cables, the wireless range can reach 100 feet (depending on environmental factors). 3. High-quality Sound Transmission: Wireless microphone system, the delay is less than 5 milliseconds, the delay is less, and the signal loss is less. High-quality audio provides stable sampling rate stereo uncompressed digital transmission. 4. Rechargeable Battery and Power Indicator: The transmitter and receiver can be charged simultaneously through a dual-port USB cable. More than 3.5 hours playtime. You can know the battery level and related channel indicators when you turn it on. 5. Multiple Uses: Compatible with mixers, recorders, speakers, sound reinforcement systems, power amplifiers, etc. Provide stable and reliable wireless transmission (Note: The transmitter is only suitable for dynamic microphones, without power supply or battery, not suitable for microphone with power supply.) Package includes: 1pc of Wireless Microphone System Receiver 1pc of Wireless Microphone System Transmitter 1pc of Rechargeable Power Cord 2pcs of metal transform plugs 1pc of Instructions Warming Tips: Computer monitors display colors quite differently,the color of the article may vary slightly from the pictures above. Please allow 1-2cm differences because of the manual measurement.