EXTREMELY IMPORTANT: Gloves ARE NOT heavy duty winter gloves as shown on the product picture. The gloves are designed to shield from RF radiation, not cold. You WILL NOT FEEL any stimulation or sensation when using the gloves, nor will you experience any immediate cure or reduction in symptoms when using the gloves. They are protective in function, against unseen and unfelt radiation and frequencies which can prove dangerous over long periods of time. The gloves work right out of the package! Glove SIZE is ONE SIZE FITS ALL which corresponds with a Medium size, unisex. LARGER and SMALLER sizes, from XS, S, M, L and XL are AVAILABLE by contacting us. WE ARE HAPPY TO EXCHANGE GLOVES FOR A DIFFERENT SIZE with our compliments. Please contact us. No cord or device is required to benefit from the gloves' RF Shielding qualities. The gloves do have a snap that can however be used for grounding, which does require that the gloves be connected to an appropriate grounding cable which must be purchased separately. WE ARE HAPPY TO EXCHANGE GLOVES FOR A DIFFERENT SIZE with our compliments. BEFORE BUYING: RF Gloves are are meant to provide a protective function against radiation and frequencies that can be damaging over the long term. You should NOT EXPECT this product to have an immediate effect or provide immediate relief of symptoms, discomfort, or other issues.