You won't necessarily feel as though this is working when in use - you should feel the effects of using it in the hours following use. Don't feel tempted to turn it up to full power to make it work - that isn't necessary.

This easy-to-use Circulation Booster works with your body to stimulate the calf muscles, using a patented electrical muscle stimulation technology to actively improve circulation, increasing blood flow and helping to relieve achy-feeling legs.

Who cannot use Revitive Circulation Booster?
Revitive Circulation Booster (all models) should not be used by people who are:
*Fitted with an electronic implant such as a pacemaker or AICD
*Being being treated for, or have the symptoms of, a deep vein thrombosis (DVT)
*Pregnant

Online Guide: https://www.manuals.co.uk/revitive/circulation-booster/manual