The HoMedics® Duo Climate Facial Wand features 4 treatment levels for a customized experience. The hot mode is used to infuse creams and serums, while the cold mode is used to reduce redness and puffiness. Switch from hot to cold in only 3 seconds. The sonic vibration feature can be used with either hot or cold. The included battery is USB rechargeable. The cordless design is ideal for travel and portability.