VEODOX Triple-Action Knee Massager

FLEX KNEE: 3-second heating onset. EMS massage your way.Six EMS modes with 19 active intensity levels in each, plus an off option. EMS pulse frequency is approximately 4–60 Hz. Choose 38°C, 42°C or 45°C, or no heat. Use warmth alone, EMS alone, or both together. Built-in 660nm red light.EMS uses electrical pulses through skin-contact electrodes to stimulate motor nerves and produce muscle contractions when stimulation is sufficient. Red light and heat are separate features.