What speakers are better for teachers to use in class?

The speaker Philips used by the teacher in class is better.

Philips megaphone:

Philips Burt's Bee Microphone is guaranteed for one year. It is stylish and mini, beautiful in appearance, light and portable, with 3W speaker with high power and loud voice, and can easily realize classroom teaching for 100 people. Full battery life of 6 hours, noise reduction and upgrade sound without distortion and howling, support SD card USB flash drive, long-time recording function.

User feedback: the speaker is loud and there is no noise, and there is no harsh sound when listening to students' feedback. The charging time is a bit long. It takes more than three hours to fully charge, but it can be used for more than one week at a time after being fully charged. The white appearance is very beautiful, which is very suitable for female teachers.

Function of megaphone:

Speaker is a kind of electronic equipment, its main function is to reduce the spread of sound, amplify the input sound and make the sound spread further. Speakers are mainly composed of iron, paper, magnets and copper wires. Its working principle is that the electromagnetic interaction between the audio AC signal of the magnet and the coil makes the surrounding air vibrate and make a sound. Speakers can be divided into wired speakers and wireless speakers.

Wired speakers are mainly used for small meetings, outdoor tourism activities, tour guides, commodity promotion, auctions, etc. , and divided into waist-hung speakers and handle speakers. The most basic feature of wireless speakers is the wireless transmission mode of sound signals. The process that the sound signal is transmitted only by carrier wave in the air and received by the receiving end is called wireless transmission of wireless loudspeaker.