[Clear no whistling] equipped with IC / CVC dual technology, through the acoustic expert tuning three tone ratio combined with the principle of frequency shift, greatly reducing the whistling frequency.
eBay
SHIDU 10W Portable Voice Amplifier Wired Microphone Audio Speaker Natural Stereo Sound Loudspeaker for Teacher Megaphone S258
Aliexpress UK
This Voice Amplifier is a multifunctional portable loudspeaker with sound-amplifying, digital music playing function. Output power: 12W. In order to achieve the best sound amplification, place the microphone head 1cm in front of the mouth and speak at the microphone head;.
eBay
Portable Voice Amplifier Megaphone Mini Audio Speaker With Microphone Rechargeable Ultralight Loudspeaker for Teachers teaching
Aliexpress UK
[Clear no whistling] equipped with IC / CVC dual technology, through the acoustic expert tuning three tone ratio combined with the principle of frequency shift, greatly reducing the whistling frequency.
eBay
Zoweetek Portable Voice Amplifier Wired Microphone AUX Audio Speaker for Teachers Instructor Z258
Aliexpress UK
『VOICE AMPLIFIER & BLUETOOTH SPEAKER 』 - This is not only a nice voice amplifier which can project your voice clearly and loudly, but also can be used as a bluetooth speaker. Supports recording, loop playback, Aux input, micro SD card and U disk.
eBay
RETEKESS PR16R Megaphone Portable Voice Amplifier Microphone Speaker 12W FM Recording Mp3 Player FM Radio Tour Guide Teaching
Aliexpress UK
You can attach it to your belt or trousers, or hang it around your neck or waist using the adjustable shoulder strap. The extra clip on the back ensures easy operation. It is easy to carry and provides clear voice output due to its lightweight design and small size.
eBay
SHIDU 30W Portable Voice Amplifier with Wireless Microphone For Teachers IPX6 Waterproof Bluetooth5.0 Speaker 5000mAh Power Bank
Aliexpress UK
[Clear no whistling] equipped with IC / CVC dual technology, through the acoustic expert tuning three tone ratio combined with the principle of frequency shift, greatly reducing the whistling frequency.
eBay
SHIDU 15W Portable Voice Amplifier Wired Microphone AUX Recording Personal Audio Bluetooth Speaker For Teachers Instructor S298
Aliexpress UK
[Clear no whistling] equipped with IC / CVC dual technology, through the acoustic expert tuning three tone ratio combined with the principle of frequency shift, greatly reducing the whistling frequency.
eBay
Speaker for Teachers Loudspeaker Microphone Portable Voice Amplifier Mini Wired Audio Natural Stereo Sound Speech
Aliexpress UK
Loudspeaker, powerful amplification effect, no noise, sound restoration, good effect. Microphone Output Interface: 3.5mm. 1 x Cable Head Microphone. Lithium Battery Capacity: 1 18650 battery (included).
eBay
RETEKESS PR16R Megaphone Portable Voice Amplifier Microphone Speaker 12W FM Recording Mp3 Player FM Radio Tour Guide Teaching
Aliexpress UK