The THINKRIDER X2-2 SMART TRAINER is a smart roller trainer perfect for cycling training. - Brand: THINKRIDER - Model Name: X2-2 SMART TRAINER - Accessories: Power adapter, cable, instruction manual, thru-axle parts, quick-release parts *The thru-axle parts are already attached to the main unit. - Condition: Used. No noticeable scratches or stains, but it hasn't been cleaned much, so there's quite a bit of dust. Please understand. Firmware is the latest version. Thank you for looking. ★Important Notes★ Shipping labels will be affixed directly to the outer box, so please be aware. (Occasionally, some people consider the application of shipping labels as damage to the product, so just in case...) Compared to other smart rollers, the flat road resistance feels a bit heavier (about 1-2 gears). The speed of the load change on ascents and descents is also slow, but it feels natural on gentle ups and downs. The power value on flat roads is slightly lower, but within an acceptable range... However, it tends to: - Significantly overshoot at the start of a climb, and - Significantly undershoot at the end of a climb or the start of a descent. This can cause you to fall out of sync with the group's pace. Because of this behavior, you might unintentionally surge ahead of the group at the start of a climb, and then fall behind at the end, instead of rejoining the group. Recently, I've been participating in ZWIFT races and events more often, and it's become stressful, so I've decided to sell it. I don't think it will be a problem for solo free rides or workouts with a fixed load. When I bought it two years ago, the behavior was quite unstable, but it has improved with each firmware update. Apart from the slightly heavier feel on flat roads and the power over/undershoots mentioned above, there are no other problems. However, It seems that there haven't been any releases for a long time since the current firmware, so it seems to be the end of the line. So close, yet so far. It's a very regrettable model.