Description: Vertical Jump Tester : It can count how many times that your kids jump in one minute, cultivate children's interest in high jump, help exercise high jump, and promote the growth of body height.(Requires 1 AA battery- not included). Easy to Use : Jump to touch it and you get one count Easy to Install : It can be easily stuck to a wall or a door or anywhere you want. Inspiring and Encouraging : Our jumping trainer is equipped with an electronic equipment for counting so kids can be encouraged or inspired to achieve a larger number than before that the times they jump in one minute. Achievement : Jumping properly every day will help you grow taller, this jumping trainer tool is very encouraging which can bring sense of fulfillment for your kids. Specification: Material: Metal Size Chart: Line Length: 75cm/29.53inch Trainer Length:12cm/4.72inch Package Includes: 1x Vertical Jump Tester Note: 1. This is not infant toy , please take away from kids to avoid eating. 2. Please allow slightly error due to manual measurement. 3. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 4. Wish you a wonderful on-line shopping!