Tips on using multiple sets of microphones at the same time: Dear friends, if you need to use two or more sets of microphones at the same time, you need to lock different frequencies. Methods as below: 1. Turn on the receiver. 2. Press and hold the power button and frequency setting button of the microphone at the same time. 3. When four red dots appear on the microphone screen, the frequency of this group of microphones is locked. 4. The other microphones are set in the same way, and the frequency of each group cannot be the same. Features： UPGRADE SOUND QUALITY: JISSDO microphone have the characteristics of high sensitivity and high stability, adopt new noise suppression technology to restore the warmest sound. Even if you are singing or giving a speech, you can adjust the volume or Echo without the microphone system that ensure the live effect. FASHION APPEARANCE: The microphone handle is made of high-quality aluminum alloy, stylish and high-end gray and navy blue, which can show your personal charm in any occasion. GREAT BATTERY LIFE: In the fully charged state, karaoke microphone can continue to work for 5 hours, meet your needs for each occasion. Maybe you're tired of wasting money on disposable batteries and not environmentally friendly. EASY TO USE / SET: No complicated procedures! Suitable for anyone. Just turn on the microphone and receiver, it will connect automatically. The upgrade connection technology can ensure that the signal can be received within 50m(Barrier-free space). UNIVERSALLY APPLICABLE: JISSDO Used the 6.35mm interface and a 3.5mm adaptersuitable for most devices, like small live concerts, Karaoke, outdoor wedding, conference, church, classrooms. PACKAGE CONTENTS 1 x Handheld Microphone 1 x Mini Receiver 2 x Rechargeable Battery 1 x Charging Cable 1 x 3.5mm Adapter 1 x Microphone anti-rolling protection ring 1 x User Manual