Sell Rolton K400 Loudspeaker Microphone Voice Amplifier Booster Megaphone Speaker For Teaching Tour Guide Sales Promotion best price

Professionally amplifying sound, loud, clear, low feedback. Comfortable and convenient for Teachers, Coaches, Tour Guides, Presentations ect. Unique appearance design, small size and light structureRechargeable and replaceable 1200 mAh lithium 18650 battery.It can be used for 8 hours. Play music for about 4-8 hours (volume 50%-80%). Compatible with all media devices with 3.5mm AUX port as SPEAKER ; support TF Card (Not more than 32GB) MUSIC PLAYER, can directly play MP3,WAV format audio. Insert a TF card, then it will support recording function and playing the recording files via the dual 3W HD stereo speakers. This product can Continuous work for 72 hours. This product Single track loudnesss can reach 128dB.