Purchased 6 years ago and kept in the car the whole time. There is dirt on the back, etc. The following is a description of the product: While riding in cars, buses, or trains, we are exposed to DC and AC electric fields, magnetic fields, and electromagnetic waves from cell phones (excluding 5G) and Bluetooth, and various stresses also arise. When the body is burdened by electromagnetic waves, examining it with the Paul Schmidt Bioresonance Practitioner's Rayocomp reveals stagnation in the flow of energy at the same frequency every time. The CAR Rayex has six frequencies set in its module (the core component with a dipole antenna structure) to remove stagnation of energy and prevent it from occurring. It does not use batteries. Place it near your body. Place it next to your pillow when you sleep. For 5G countermeasures, we recommend the Mini Rayonex 5G. Size: 24 x 4.5 x 1.5 cm Weight: 230g The color of the sticker has changed.