Product Price Quantity Subtotal × DIY Sound Control LED Music Spectrum Electronic Kit Crystal Column Audio Display PCB Soldering Practice Kit LM339 LM358 DC5-12V Shipping: [Free] (20-30 days) $6.79 DIY Sound Control LED Music Spectrum Electronic Kit Crystal Column Audio Display PCB Soldering Practice Kit LM339 LM358 DC5-12V quantity $6.79 Coupon: Apply coupon Update cart Cart totals Subtotal $6.79 Total $6.79 Proceed to checkout