The Gemini is the strongest digital unit. It has the ability to pulse independently on each side of unit. The SYNC feature allows the unit to pulse at the same time. Bringing two attachments together in the SYNC setting creates a Helmholtz field. This is a desktop version for use in an office or home. This has a dual membrane controller on the top of the unit for easy access to buttons. 

Very Strong Feel

Attachments Sold Separately

120-240 VAC 50-60 Hz