Rolton Portable Voice Amplifier, Megaphone Booster with Microphone Loudspeaker Personal PA System for Voice Amplification [Clear and Loud Sound and Multiple Format Support] Amplify your voice and save your throat at any time you need it. Provide clear and stable sound, perfect for groups with many people.The product itself has two mainly functions use, one is an amplifier, and another one is a multi-applicability speaker.The speaker can apply on MP3 and WAV o form. 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. [Versatile and Practical] Powerful, portable, and super easy to use, this amplifier speaker system is a must-have! It can be used for a wide range of purposes, to make your voice heard at meetings, or when teaching in a large room, for big outdoor events, such as weddings, or tourist guides. [Rechargeable Voice Amplifier] Built-in a large 1200mAh lithium-ion battery, so that the microphone speaker full charge only takes 2-3 hours, but play amplification time up to 3-4 hours, music playback time up to 4 hours.Amplifier has clear voice, stable, and loud sound to use in coaching, presenting, training, teaching with many people in big space. [Mini Size to Carry] Mini and portable. The compact size and light weight allows it to function anywhere, such as teachers, outdoors, etc. Compact in size, but with a built-in loud speaker capable of producing powerful results. [Indicator Light Design] The indicator light gives different signal. The blue indicator appears when power on. It flashes. when insert TF card/USB flash drive. When remaining electricity is below 10%, the blue light. will flash. On the charging status, the red indicator is be on until fully charged would be off. Portable Voice Amplifier with Wired Microphone Loudspeaker Speaker FM Radio MP3 The speaker can apply on MP3 and WAV o form. Music player and PC speaker are included Music player hastwo interfaces, one is for TF card, and another interface is for USB flash drive Portable Voice Amplifier Megaphone Booster with Wired Microp