Voice Amplifier,SHIDU Mini Voice Amplifier with Wired Microphone Headset 15W Portable Personal Speaker MP3 Audio Sound System for Teachers,Elderly,Singing,Coaches,Yoga,Tour Guides,Outdoor Trainers

Voice Amplifier Portable SHIDU S512 Voice Amplifier with Wired Microphone Headset 15W Mini Personal Speaker for Teachers,Elderly,Singing,Coaches,Yoga,Tour Guides,Outdoor Trainers

2 pcs Portable Lapel mic 3.5mm Audio Compatible with Voice Amplifiers S6 (by AKindle)

ZOWEETEK ZW-Z258 Portable Rechargeable Mini Voice Amplifier for Teachers with Waistband, Portable Speakers Supports MP3 Format Audio for Speech, Class, Training,Tour Guide, Power Amplifiers