HEAT and MASSAGE CAN WORK AT THE SAME TIME?There are 3 steps about USB Version : (1)You need to choose the heat attachment, which must be fully inserted.(2)Click the Power button, when the Gear display "C", and you can raise the temperature by pressing this speed "+" button. (3)Switch to speed mode by Clicking the Power button,choose the speed you want by the "+"/"-" button. So you can enjoy the heat and massage. If you have any questions,please contact us first, we will solve the problem. ?35db SUPER QUIET & ADVANCED NOISE REDUCTION TECHNOLOGY?ultra-quiet during the massage; Deep Tissue Massager with high precision mode, head and body are closely related, effectively reducing noise (<35dB), friendly massager at home, gym,office without disturb other people. ?Upgrade USB Charge & Easy to Charge?2600 mAh battery can last 18 hours when use 1th gear,and when use 20th can also last 3 hours, Don't worry about suddennly lack of electricity in use, about 3 hours can be fully charged.USB Charge Easy to Charge and carry. ?20 SPEED LEVELS & DEEP TISSUE MASSAGE?Reaches tissue as deep as 14mm,with 20 speed settings ranging from 1300 to 3700 rpm meet different muscle group, provide great deep tissue massage. perfect for outdoors, athletes, gymnasts,drivers and so on. ?8 ATTACHMENTS(HEAT & COLD) MUSCLE SORENESS RELIEVES?8 massage attachments can relax the muscles and deep tissues of the whole body. Especially, the heat head temperature range is 95-149?(35-65?), It can accelerate blood circulation, relax muscles,release the pressure,The recommended temperature is 35-40? to avoid SCALDING;the cold head can quickly relieve muscle soreness, pain and other discomfort.You need to put in the refrigerator for a period of time when using cold attachment.