It can track your performance in time . speed . distance . and calories burnt. A safety emergency key with a clip connects you to the treadmill . stops it immediately in an emergency . and protects you during exercise.After exercise . the portable treadmill can be easily folded up and the folding area is 25(L) x 24(W) x 48(H). The 2 built-in transportation wheels make the treadmill easy to move around and store in a small place at home.The foldable treadmill has a built-in Bluetooth speaker . so you can enjoy music while exercising . providi