Can I use it while sitting at a desk?

Yes. It is designed for seated pedaling under a desk, and the low height lets your knees clear most desks. Standing use is possible but less stable.

Is it good for bad knees?

The low-impact motion puts little stress on joints, and owners with knee and hip pain often report it is comfortable. Check with your doctor if you have a specific injury.

Does it need to be plugged in?

No. It is cordless and runs on the included LR44 battery, which powers the LCD. The pedals and tension are mechanical.

How hard is the resistance?

The adjustable tension is meant for light to moderate effort. Fit riders usually find even the top setting easy compared with a gym elliptical.

What comes in the box?

The trainer and an LR44 battery for the display. Assembly is minimal.

Can it replace a gym workout?

No. It gives light cardio and leg movement, not the resistance or stride of a full elliptical or treadmill. Treat it as a supplement to other exercise.