If you would like to use the Orbit without the Steps app or smartphone, you should press the reset button (at 12:00 pm), which you can find on the back of the device.
You will not be able to enter personal details like your weight, for instance. The device will use average data in order to calculate Calories Burned.
Usage without app synchronization
The Orbit can save data for about a week. If you do not use a smartphone to synchronize the data then the Orbit will start deleting old data.