Hot Gemstone Therapy - Amethyst crystals Far Infrared Heat Therapy Negative Ions Therapy Red Light Therapy Pulsed Electromagnetic Field Therapy Operation system :Far infrared ray and negative ions Heating element : carbon fiber heating wire(26000pcs), which releases far infrared ray and proves the service life . Time setting : 5-60 minutes Temperature setting : 25-90 Celsius degree Material : High-end PU leather photon light :6 pcs red light (660nm in wavelength) Features: PEMF mat Mattress size :100*50cm (40″ x 20″) Energy stone: Amethyst crystals