The 2 varieties are the Boston Marathon Treadmill 3.0 and the Boston Marathon Treadmill 4.0. The 4.0 has SpeedRing technology. SpeedRing is a hands-free speed control that taps the services of Bluetooth.
ແນວພັນ 2 ແມ່ນປື້ມປະຕິບັດການ Boston Marathon Treadmill 3.0 ແລະ Boston Marathon Treadmill 4.0. 4.0 ມີເທກໂນໂລຍີ SpeedRing. SpeedRing ແມ່ນການຄວບຄຸມຄວາມໄວທີ່ບໍ່ໃຊ້ມືຖືທີ່ສໍາຄັນກັບການບໍລິການຂອງ Bluetooth.