I tested the device VERT: Wearable Jump Rate Monitor. It is designed to test your vertical jump. To start, you have to download the app (it was easy to download), and then create an account. Then you have to charge your VERT for two hours. After the charge is complete you will see a blue light turn on, then you have to go to settings and go to VERT sensors and click connect. Finally you attach the monitor to the belt and then put the belt on your waistband and start jumping. For me the VERT worked very well and was very accurate. I would definitely use this device again. I think you could also use it if you're a basketball player to see how high you can jump to dunk the ball. I would recommend this device to anyone who wants to improve their vertical jump and get a good workout.