The Neutrogena Light Therapy Acne Mask Activator should be used after you finish your first 30 sessions with the mask. Keep your mask, and use this activator to power thirty additional 10 minute light therapy acne treatment sessions. The activator ensures that the right amount of light is emitted during each session to give you the best results. It works with the face mask, which harnesses the power of clinically proven technology to clear acne and allow skin to heal itself. Connect the activator to your mask and use daily to see clearer, healthier skin with this chemical free and UV free treatment.