Bricks , Brick Motors , Motors & Electronic Components Blue Sound Unit Temporarily sold out Price $1.75/ea Quantity - + Total $1.75/ea Get notified when in stock. Information Out of Stock Quick View Blue sound unit that connects to other bricks and brings your builds to life with animated noises. SKU: 99131B SKU: 99131B Weight: 30.1 g Brick Size: 4×4