it's Oh So Quiet Low Noise Fountain.

It's Oh So Quiet is a fountain-style firework by family favorites Standard Fireworks. The name does somewhat give away what it does, however, It's Oh So Quiet produces alternating silver and gold sprays with the odd colour interspersed. With a duration of 1 minute and its low noise effects, It's Oh So Quiet would be ideal for a family Bonfire Night party at home. The minimum viewing distance for this firework is 8m.