ZORBES Voice Amplifier for Teachers - Microphone Headset Set 2200 mAh, with Headset Microphone Support TF Card/U Flash Disk, Portable Voice Amplifier for Teachers, tour guide, coach, speaker Swimming More Details:Hat circumference about 54-60

More Details:Hat circumference about 54-60 cm

120 HIGH DECIBEL:Crisp and loud whistle

This creative cartoon backpack features a cute

Compact and portable design allows convenient play at home

Not just can expand the capacity

ZORBES Voice Amplifier for Teachers - Microphone Headset Set 2200 mAh, with Headset Microphone Support TF Card/U Flash Disk, Portable Voice Amplifier for Teachers, tour guide, coach, speaker Swimming More Details:Hat circumference about 54-60POWERFUL SOUND: Compact size voice amplifier with 8W output is clear and noiseless, enough to cover a large room of 10 50 people. Amplifies your voice and saves your throat. LIGHTWEIGHT POWER PACK: Voice Amplifier This microphone and speaker set is a portable public address system. You can take it to multiple places, such as classrooms, bingo calls and outdoors. VOICE AMPLIFIER CAN LONG WORK DURATION: Built in 2200mAh battery. Can work for 8 hours as