Vias CYLNDR battery powered Bluetooth Wireless Speaker with microphone / instrument input and echo effect &ndash; Karaoke Singing &ndash; Guitar practice amp &ndash; personal PA Portable stereo Bluetooth speaker with superior range (over 100') with sleek and modern design. Great for many applications: Music player, singing or playing along with the music, microphone amplification, music practice, mixer Plays music from a variety of sources: Bluetooth, USB flash drive (supported audio formats: MP3, WMA, WAV, APE, and FLAC), and AUX in (3.5mm stereo input) Also features a microphone / instrument input jack for dynamic microphones, electric guitars, synthesizers, drum machines, etc. This input includes an adjustable echo effect for added flexibility, creativity, and blending options Internal rechargeable lithium battery provides up to 3 hours of uninterrupted operation (~ 4 hours at 75% volume) and foldable handle for ultimate portability Lightweight yet powerful amplifier delivers crystal clear sound; loud enough to fill an entire room with music!