Auto Connect: Our wireless microphones and speaker are very easy to set up. You just simply turn on the receiver, then turn on the portable microphone, and the two parts will pair automatically. (Notes: if they don't match successfully, just turn off the device and try again) Long Battery Life & Wide Distance: Built-in upgrated 2200mAh rechargeable batteries, offering an extensive 10-12 hours of amplification on a full charge with only 3-4 hours charging time. While this wireless microphone delivers 6-8 hours using time on a full charge just 1-1.5 hours, and the accessible reception distance is 20 meters, which is enough for using it during the class Lightweight & Portable: This voice amplifier and microphone are small in size and lightweight, and can be placed in the palm of the hand or in a bag for use anytime and anywhere, making them very portable. The voice amplifier is equipped with a clip on the back, which can be clipped onto clothes and pants without falling off. It also comes with a strap, making it comfortable to wear around the waist without causing any discomfort or burden Satisfied Service: We provide 24-hour online support and 18-month wa rranty, if any questions, pls feel free to con tact us Essential for Teachers: This portable microphone and speaker is an ideal practical gift for educators who frequently deliver speeches or provide guidance to a large audience. Built in high fidelity audio technology, it ensures clear audio projection, allowing classrooms with over 100 students to hear your voice clearly and providing effective protection for your throat Omnidirectional Sound Reception& Clear Sound Quality: Built-in intelligent active noise reduction chips, no matter in any noisy environment, our equipment can provide effective original sound recognition and clearly record every detail of sound. Addition, equipped with advanced High Density Spray-proof Sponge, reduce wind noise and clutter AI algorithm intelligent noise reduction module accurately filters all types of noise, has strong anti-interference ability and ensures sound quality