●SAFETY - Heated vest made of 100% polyester fiber, adopts the Infrared heating technology combined with ergonomic clothing design.Built-in thermal protection module,5V 2A/2.1A power supply without no radiation, Low and safe voltage for people.Once it is overheat, it would stop until the heat return to the standard temperature ●HEAT ACROSS BODY - Rechargeable heated vest desiged with 5 carbon fiber heating elements generate and trap heat across core body areas (left waist, right waist, left flank, right flank, and mid-back),which can effectively warm body and dredge the meridians ●HEAT ACROSS BODY - Rechargeable heated vest desiged with 5 carbon fiber heating elements generate and trap heat across core body areas (left waist, right waist, left flank, right flank, and mid-back),which can effectively warm body ●3 HEAT SETTINGS ADJUSTABLE HEATING - 3 Heated levels from 45℃/113 °F to 65℃/149°F with smart heating systerm. High(Red button about 65 ℃/149°F), Medium(White button about 55 ℃/131 °F) and Low(Blue 45 ℃/113°F), three heat settings allow you to change the level of warmth with the push of a button ●USB POST TO CONNECT POWER BANK- USB heated vest built-in USB port to connect the power bank(power bank is not included)