Psi BandsAcupressure Wrist Bands for the Relief of Nausea - Crystal Clear by Psi Bands

Do they stop or prevent the dizziness that comes with motion sickness before the nausea starts?

Is the plastic hard/uncomfortable? Has anyone tried these versus the cloth type of other brands?

Does the band work if you only wear one?

what does the $7.50/count mean??