The children's high jump trainer is a great helper to promote height growth in children. It switches off intelligently when not operated for 30 seconds, saving energy and reducing losses, and is designed with a voice counter that counts instantly every time your child clicks it. You can use this touch high jump audio counter to enlighten your child on high jump training and practice daily to help work on jumping high and also to promote height growth. Indoor play prop for children, Chinese/English switchable back and forth, you can long press to switch the language of the touch high jump voice counter to better stimulate your child's interest. (1 x AA battery required, Included in the package) It is best not to put the high jump counter too high or too low. Too high will reduce interest. So, place it as high as your child can reach and then gradually increase the height. The vertical long jump tester is perfect as a gift for children and relatives, giving them a very good experience of using it, designed to encourage high jumping, stimulate fun and enhance sportsmanship.