SuperEar
SuperEar Plus Model SE7500 Personal Sound Amplification Product with Case, Headphones and Discreet Earbuds
MEDca
Personal Sound Amplifier - Audio Hearing Amplifier Device and Voice Enhancer Device for Sound Gain of 50dB, Up to 100 Feet Away, Pocket Hearing Devices
WinBridge
WinBridge WB003 Portable Voice Amplifier with Wired Headset Microphone,Support Bluetooth Play Music,Personal Speaker and Microphone for Teachers, Megaphone Microphone Headset with Belt Clip and Strap
Reizen
Reizen Loud Ear 110dB Gain Personal Amplifier