The device has been with me for two months and I haven't used it much, and the proof is that the original oil is still in it and it is in excellent condition. The device measures distance, time, and calories on the screen and is equipped with a safety key, God forbid. Maximum speed is 10, and it also has specific training programs for the day. You can fold the device and change the angle of the grip using the screws. I haven't used the replacement oil even once, and it's in its condition, along with the Allen key. The price is negotiable, and please do not lowball.