Only used a couple of times. Works great with the Mendi app — just not for me. The app is free; you only need the headband to use it. Helps boost meditation, stress management, focus, clarity, sleep, and can support attention or mood symptoms. Mendi is a portable neurofeedback brain training system that uses fNIRS technology (functional near-infrared spectroscopy) and behavioral science to enhance overall brain health. Comes with USB-C charging cable. Wipe with alcohol before each use if you’re acne prone. From a smoke-free, pet-free, fragrance-free home (including shampoo and conditioner). Pink doll shown in photo is not included. Keywords: Mendi headband, neurofeedback device, brain training tool, meditation tracker, focus trainer, stress relief, mental clarity, cognitive enhancement, mindfulness tech, wellness gadget, sleep improvement, mental performance, relaxation tool, attention training, brain health device, used Mendi with charger, smoke-free home, pet-free home, fragrance-free home