Specifications:Equipped with large capacity battery and bluetooth-compatible function, this voice amplifier with microphone can also be used as a radio, voice recorder and telephone speaker, and supports TF card and input.Built-in 3.7V/3000mAh large-capacity battery, which has a higher safety index and a longer battery life.It can be used in many places in stations and outdoors, and you can also use it in classrooms, subways, etc.It is not only an amplifier, but also a portable bluetooth-compatible speaker, so you can stream your favorite music from any Bluetooth-enabled mobile device 10 meters away.This loudspeaker has a TF card(Micro-SD Max: 64 GB) player, which can also be used as a speaker to reproduce music and play all music tracks in a loop.Item Name: LoudspeakerPower Supply: 5WBattery: 3.7V 3000mAh(Included)Working Time: 5 HoursCharging Time: 2 HoursPower Supply: USB/DC 5VPlay Mode: Support bluetooth-compatible and TF Card PlayDisplay: Multifunctional Digital DisplayFunction: Support MP3 and FM RadioPower Supply: USB/DC 5V-0.5AMaterial: ABSFeatures: Multifunctional Voice Amplifier, Long Working Hours, with Microphone, Support Bluetooth, TF Card PlaySize: 9.7cm x 7.6cm x 3.6cm/3.82" x 2.99" x 1.42" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Loudspeaker1 x Microphone1 x USB Charging Cable1 x Belt1 x User Manual