.Put some food into the ball(the food size should be suitable)? pets are crazy about food and then play with it.

.Creative design? no battery required? magneto electricity make the sound.

.In different directions and different speed can change volume.

.The ball can not only help pet take exercise and develop its intelligence quotient.

.The sound won't disturb your neibourhoods.

8 cm in diam. Weight 75g