Nd-fe-b magnet horn ensures sound clear, strong penetratingand and wide coverage. 10w sound output is loud enough to cover a big room -- Can be used for group of 25-100 people.Equipped with special acoustic microphone -- HiFi original sound amplification. Stylish, ergonomic, mini size, lightweight, sleek and comfortable design. Can work as speaker for mobiles, computers, iPads/ tablets (Microphone port can be used as 3.5mm aux audio port). Supports USB flash drive playing & TF card playing. Ultra-portable design of loudspeaker - With the help of a waistband, you can wear this voice amplification device around waist or hang it on neck. Amplifying time is up to 12 hours. Music playing time is up to 10 hours. Only need 3~5 hours to be fully charged.