Material: ABS + electronic components Size: 181*16*18.5mm Features: Built-in highly sensitive microphone (voice control) colorful lamp beads No less than 8 display modes 4 levels of brightness adjustable 5-level speed adjustable 18 color modes adjustable Comes with AGC automatic gain control Exclusive intelligent de-noising algorithm, can be used in noisy environment Product parameters: Input voltage: >DC 5V 1A Frequency response: 50-16KHZ Instructions: MODE/SPEED key: Short press to turn white-select mode; long press to turn red-select 5 speeds COLOR/BRIGHT key: Short press to turn white-select color; long press to turn green-select 4 levels of brightness Press two keys at the same time: Press at the same time to turn blue-to learn the environmental noise spectrum Press and hold COLOR at the same time when power on: enter gain setting mode Power on (battery model only): Press the COLOR key after power off Shut down (battery model only): keep face down for 3 seconds Optional USB powered(Need to link usb line for use)