Colour: Black Material: ABS The product itself has two mainly functions use, one is an amplifier, and another one is a multi-applicability speaker. Amplifier has clear voice, stable, and loud sound to use in coaching, presenting, training, teaching with many people in big space. The speaker can apply on MP3 and WAV audio form. Music player and PC speaker are included. Music player has two interfaces, one is for TF card, and another interface is for USB flash drive. The indicator light gives different signal. The blue indicator appears when power on. It flashes. when insert TF card/USB flash drive. When remaining electricity is below 10%, the blue light. flash. On the charging status, the red indicator is be on until fully would be off. Package Contents: 4 x Loudspeaker 4 x Battery 4 x Professional Wired headset Microphone 4 x USB charging cable 4 x Waistband Belt Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.