The teacher speaker amplifier has a clip on the back, you can clip it on a belt or the waistband of the pants. The wired headset microphone is adjustable. Stable Performance - This is an original voice amplifier with stable performance.
eBay
AIYIMA Vibration Full Range Speaker+ Amplifier+ Plug 2 Inch Audio Mini Portable 4/8 Ohm 20/25W Resonance Speakers Diy Bluetooth
Aliexpress UK
[Versatile and Practical] Powerful, portable, and super easy to use, this amplifier speaker system is a must-have! Music player and PC speaker are included.Music player has two interfaces, one is for TF card, and another interface is for USB flash drive.
eBay
2*25W Portable Stereo Vibration Speaker Audio Loudspeaker with 50W Bluetooth 5.0 Class D Amplifier DIY HIFI System Home Theater
Aliexpress UK
【Handheld Design】:The ergonomic handheld design ensures simple operation, allowing you to quickly your voice or play recordings with ease. We'd like to settle any problem in a friendly manner.
eBay
Set Sale 2*25W 2.0 HIFI Portable Resonance Vibration Speaker Full Range Audio Loudspeaker Bluetooth 5.0 ClassD Amplifier Theater
Aliexpress UK
Digital Mini Hearing Aids Invisible In Ear Small Sound Voice Amplifier Enhancer. This heard in hearing amplifier is designed for old people or people with hearing problems, suitable for those people who was hearing loss or patients.
eBay
Sound Box Multifunction Super Bass Music Amplifier Plug-in Mini Portable Hamburger Speaker for Home Travel
Aliexpress UK
The latest digital sound processing technology is adopted to solve 95% of Squealing. Less noise than analog sound processing products. SAY GOODBYE TO SQUEALING:Hearing amplifier reduces squealing by 95%.
eBay
Home Bluetooth Gaming Speakers Portable USB Subwoofer Surround Stereo Sound Amplifiers Soundbar Speaker Desktop Speakers For PC
Aliexpress UK
【DETACHABLE COMFORTABLE MICROPHONE HEADSET】 2 in 1 wireless microphone headset adopts UHF wireless transmission technology - more fast and stable. With removable ear hook, can be serve as head-worn/ hand-held Mic.
eBay
Portable All-in-One Bass Amp - Built-in Effects+Wireless Recording - Mini/Go/40W Models for Global Musicians（Hot Sale SEA/EU）
Aliexpress UK
[Versatile and Practical] Powerful, portable, and super easy to use, this amplifier speaker system is a must-have! Music player and PC speaker are included.Music player has two interfaces, one is for TF card, and another interface is for USB flash drive.
eBay
AIYIMA 2PCS 4 Ohm 10W 3 Inch Speaker Portable Square 77 MM Midrange Bass Subwoofer Sound DIY Amplifier Speakers Loudspeaker Home
Aliexpress UK
Powerful Voice Amplifier: Our voice amplifier features advanced digital amplification technology with a peak power of 10W, ensuring louder sound and excellent quality ideal for teaching, training, and promotions.
eBay
Khadas Tea USB Portable Headphone Amplifier, Bluetooth Magnetic DAC with 1160mAh Battery, Support DSD 256/PCM 384KHz/Siri Chat
Aliexpress UK