... 1800mAh Product weight: 355g Mic directivity Single direction Frequency response 80Hz-12KHz±3dB Power supply: Lithium-ion ... Amplifier, loudspeaker, microphone, reverberation Digital mini professional portable speaker with lithium battery can last stand-by time ... , conference, outdoor lecture, parade, assembly etc. This mini portable speaker is widely used for Yoga, Gymnastics , office , school ...