The hot and cold functions provide even greater relief: Instant Cold down to 48°F and Quick Heat up to 130°F. Wahl Hot-Cold Therapy Therapeutic Massager Attachments: * Smooth massage--ideal for maximum use of hot/cold functionality * Kneading massage--large ridged bumps target deep into the muscle tissue * Raised bump massage--a wide ring of small and large nodes replicates a rolling, kneading action * Ripple wave massage--creates wave-like vibration to penetrate large surface areas * Model 4292