Specification Voltage5V DCColorGrey orangeMaterialPolyester Carbon fiberTemperature levelBlue light 30℃White light 40℃Red light 50℃GenderFor Men SizeM L XL 2XL 3XL 4XL 5XLPhysiotherapy place Back 1 heating zone Size Chat SizeLength cm 1 2 Bust cm M5847L6049XL62512XL64533XL66554XL68575XL7059Features 1 Heat everywhere back total 1 zone heat 2 Soft and breathable not easy deformation adjustable three temperature levels 3 Quick heating energy saving long service time 4 Activates various functions of skin and promotes metabolism 5 Help to warm the human body consumes excess heat increases blood oxygen and fluidity 6 Provides deeper adjustment of physiological functions to avoid sub health state and restore the vitality 7 Improves body s microcirculation activate the meridians eliminate partial pain and inflammation How to use 1 Take out the USB plug 2 Access to the mobile charging power source 3 Press and hold the chest temperature control output switch for 3 seconds 4 Long press the chest temperature control switch for 3 seconds start to warm up and then adjust to the medium temperature heat when you need to always connect the mobile power 5 Manual adjustment to the third gear warm temperature of 50degrees Celsius comfortable gear temperature of 40 degrees Celsius energy saving gear temperature of 30 degrees Celsius 6 Press and hold the chest temperature control switch for 3 seconds and turn off the light to stop heating Packa