... nice loud voice, good penetration. Power output: 20W Charger voltage: 12V 1800mAh Product weight: 355g Mic directivity ... Amplifier, loudspeaker, microphone, reverberation Digital mini professional portable speaker with lithium battery can last stand-by time ... teachers, conference, outdoor lecture, parade, assembly etc. This mini portable speaker is widely used for Yoga, Gymnastics , office , school ...