An innovation in period pain relief, this medically certified Tens pad uses a combination of non-invasive Tens electrostimulation and soothing warmth, to relieve menstrual pain without the need for medication. Tens is medically certified as a completely safe pain relief treatment. With 15 intensity settings, the Em55 works by sending mild electrical impulses to block pain messages sent to the brain while the additional heat function helps encourage cramping abdominal muscles to relax. The large ergonomic design is flexible and sticks snug to your body using the self-adhesive conductive gel pads – it’s even discreet enough to wear under clothing. After a soothing 20-minute session, the pad will automatically switch off. When the battery runs low, an indicator light will display to prompt you to recharge using the included USB charging cable. Wipe clean only. 90% Rubber, 10% Plastic.