Keep your treadmill close, but your goals closer with the SpaceFlex Motorized Treadmill. Low inertia profile design, for a more realistic energy response with every foot strike. The sleek modern design has built in speakers and AUX cable to connect and play music during your workout. USB port allows you to charge your device while working out. Stay on track and move closer to reaching your goals with the low profile ASUNA 7750 SpaceFlex Motorized Treadmill.