[ Sound]This amplifier is small in size, but the 8W output is clear and noise-free, which can cover a room of 30-100 people. The stable performance perfectly amplifies your voice and protects your throat. [easy to carry]. - This portable microphone and speaker is compact and ultra-light, you can attach it to your belt or pocket using the detachable clip on the back, or you can tie it around your waist or it around your neck with a belt. [Rechargeable Loudspeaker]The loudspeaker has a -in lithium battery, the microphone speaker takes 4-6 hours to fully charge, but it can play up to 20 hours of amplification time and up to 13 hours of music playback time. [Lightweight Box]This microphone and speaker set is a portable public address system. You can take it to classrooms, bingo calls, and outdoors. [Support music playback]Amplifier TF (-SD) card playback and USB flash drive playback. You can repeat a single tune, loop all music, and switch songs. size:9.2x8.4x2.8cm Material:plastic colour:Black Package Contents: 1 x 1 x Headphone 1 x Belt 1 x USB Cable Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.