Other tips that usually solve the problem are:
1. Ensure that you have have stuck the gels onto the pad properly. Please also remove the protective layer that is still attached to one side of the pain relief pad – that protective layer you can re-use after usage.
3. Ensure just to be sure that you have the battery installed inside. Push the + Button and hold for a few seconds. If the contact surface is even and the pad is evenly covering the surface, it should work just fine.