Color: Black Material: ABS This product has two main functions: amplifier and multi-purpose speaker. The amplifier delivers clear, stable, and loud sound, ideal for coaching, presentations, training, and teaching in large spaces with multiple people. The speaker supports MP3 and WAV audio formats. It can be used as a music player or PC speaker. The music player features two interfaces: one for TF card and one for USB flash drive. Indicator lights provide status signals: - Blue light turns on when powered. - Blue light flashes when a TF card or USB flash drive is inserted. - Blue light flashes when battery level is below 10%. - Red light stays on during charging and turns off when fully charged. Package Contents: 1 x Loudspeaker 1 x Battery 1 x Professional Wired Headset Microphone 1 x USB Charging Cable 1 x Waistband Belt Only the items listed above are included; other products are not included. Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement error allowance is +/- 1-3 cm.