BataAmp Mini Voice Amplifier with Headset Microphone Wired Portable Bluetooth Speaker Rechargeable Pa System Personal Amplifier S208 for Teachers, Tour Guides, Coaches, Elders, etc

Features: 1.This voice speaker can save you from the hassle of yelling or shouting out whatyou wish to say-to put it in a nutshell you can get through the day without sufferingfrom hoarseness or a sore throat 2.The easy-to-use electronic buttons make it easy to adjust the volume levels.Whoever the audience, your voice will be heard perfectly. 3.The speech amplifier built in polymer Li-ion rechargeable batteries which offeryou up to 5 to 10 hours usage. 4.This speech speaker system is a favorite among teachers, tour guides, andoutdoor enthusiasts who need to stay in contact with large groups. Specification: Color: Blue Material:ABS Size: about 8.6cm*4.4cm*12.2cm Power output10 Watts Charging voltageDC5V, 500mA Charging time: about 3H Working time: about 8-10H Audio format: MP3,WMA,SBC,WAV,FLAC,APE Working temperature: -20?-85?