Features: Bluetooth-compatible loudspeaker DIY kit, including stereo module, amplifier chip, and music spectrum rhythm light. Suitable for welding practice, exercise hands-on ability. Can connect to bluetooth-compatible to play music and support stereo output. Equipped with 3.5mm input port, supporting corded connection to computers, mobile phones, etc. Music spectrum display, rich color, and pleasant music. When the sound cable is inserted, it automatically switches to the sound cable signal and is not affected by bluetooth-compatible sound interferences. Specifications: Material: PCB+ABS Type: without Outer Casing, with Outer Casing(optional) Amplifier board: approx. 91x43mm/3.58x1.69" Spectrum board: approx. 91x62mm3.58x2.44" Power: USB 5V Package Includes: 1Pc DIY Bluetooth-compatible Loudspeaker Electronic Kit with/without Outer Casing note: Loose part, need to assembly yourself. Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.