Read the pressure design before comparing modes
Identify whether the listing describes a closed sleeve, a vent or powered suction.
Find the feature that controls pressure
A closed-end manual sleeve can create suction without a motor. A vented housing adds an opening for adjusting pressure. A rechargeable model may actively vary suction. Start by identifying which of these designs the exact listing describes.
For example, the Pipedream Air Tight listing describes a manually adjusted vent. The Renegade Avenger lists six powered suction settings. Those descriptions tell you which controls to look for in the instructions. They do not give a common measurement of pressure.
Read mode counts by function
Count the listed suction settings separately from vibration settings. If you want a device that also moves a sleeve or housing under its own power, see the guide to thrusting, rotation and stop controls.
Check the release before choosing
Ask for the exact manual if the listing does not show how to release suction. Confirm you can reach the release or stop yourself. A mode count does not tell you whether the controls are easy to find or operate.