What is sound ball tennis you may ask? Well, it is a sport for people with visual impairments. Similar to tennis and played with a modified ball.
Sound ball tennis is played indoors using rackets and sponge balls that make sound when in motion. The rattling sound made by the balls is followed by the players. The game takes some practice and technique is such that players need to stay agile and focused on the sound the ball makes while using hand moments to hit the ball.