Specifications: Material: Lightweight Aluminum Color: as pictured Battery type: AA battery Size: as shown Package Included:1pc * vertical jump training measurement tool Vertical Jump Tester: Our children's vertical jump tester is equipped with an electronic counting device. It can count how many times your child jumps in one minute. It provides an opportunity to get kids interested in sports and encourage physical activity in kids. Your child should have such a useful vertical jump tester. Easy to use: Our vertical jump training equipment is very easy to use. Jump up and touch the basketball-shaped object and you will get a count. You can see how many times you jump in a minute. Kids can easily learn how our vertical jump training equipment works. Easy to install: When you try to install our vertical jump measurement tool on the wall, you will find the process is very simple. You don't need to dig any holes for its installation. It can be easily glued to the wall or door. Simple. Inspiration and encouragement: Our jump trainer is equipped with an electronic counting device, so children can be encouraged or inspired to jump bigger numbers than before in one minute. It is recommended not to put the product too high or too low at first, otherwise, it will reduce the child's interest. It is best to put it where the child can accept it. Achievement: Our jump training tool is very inspiring and gives children a sense of achievement when they see themselves getting better and better than before. Your child deserves it.