Once powered on, the Zinger Chair defaults to the low speed, which is commonly used for indoor use on smooth surfaces. Here's a guideline for suggested speed usage. Speed Range: Low: 0 - 1 mph (1.6 km/h) for indoors on smooth floors Medium: 0 - 3 mph (5 km/h) for outdoors walking pace High: 0 - 6 mph (9.5 km/h) for hill climbing or mowed grass