Size: S(Tag M):Height reference 160-165cm--Weight reference 50-60kg; M(Tag L):Height reference 165-170cm--Weight reference 60-65kg; L(Tag XL):Height reference 170-175cm--Weight reference 65-70kg; XL(Tag XXL):Height reference 175-180cm--Weight reference 70-75kg; XXL(Tag 3XL):Height reference 180-190cm--Weight reference 75-85kg;3XL(Tag 4XL):Height reference 180-190cm--Weight reference 85-110kg; Color:Black Interface:USB Voltage:5V Instruction: Long press the smart switch for 3-5 seconds to start, when the red light is on, the heating bottoms start to heat up and work, and the red light display sets the high temperature around 70 °C. Short F second to switch, the blue light shows that the temperature is about 60 °C. Press for 1 second and turn to green light to display the temperature at a constant temperature of 45 °C. Press and hold for 3-5 second Package includes: 1*top;1*pants; 1* USB charging cable. Does not include the battery bank. Note: 1. The actual color may be slightly dfferent from the pictures by different monitors and different lights. 2. Before buying, please pay attention to the image in the size chart. If you have any problem, do not hesitate to contact us by mail. 3.Hand washed or machine washed. It must be gently cleaned during cleaning to extend the life of the heater.