Read motor placement in the product photos
Separate motor location from mode count.
Find the powered part
A tip motor and a removable bullet occupy different locations. Look for a labeled diagram or a gallery image showing which part charges or contains batteries.
Check how many motors can be controlled
Two motors may operate together or have separate controls. A mode count does not tell you which component is moving. Use the manual for the exact model.
Decide which fit measurement matters
An open wrap and a closed sleeve do not fit the same way. See the sleeve measurement guide for cavity and opening measurements.