1. children's vertical jump tester is equipped with an electronic counting device. It can count how many your child jumps in a . It provides to kids interested in sports and encourage kids to do it. 2. vertical jump training equipment is easy to use. Jump up and touch the basketball-shaped object and you a count. Name: Touch High Jump Counter Style: , Power supply: 1 X AA battery (not included) Colour:yellow :ABS Size:12.6 x 3.2 x 9.5cm Package Contents: 1x Height Touch machine 1x height sticker 3x Adhesive Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.