pkstone heated vest for men & women, upgraded lightweight electric heated vest for outdoor fishing hunting, machine washable pkstone <p><b>pkstone lightweight usb charging heated vest, electric 5v heated jacket clothes warmer </b> </p> <p><b>how to use</b><br> 1. insert the usb port to 5v power source, we recommend 5v/2.1a power bank.(note:power bank need to purchase separately)<br> 2. long pressing the switch of the vest for 3 seconds to turn it on/off.<br> 3. short pressing the switch to change the heating mode.</p> <p><b>led power button</b><br> long press the switch button for 3 seconds to turn it on/down, short press the button to switch mode :<br> red-highest temp (60°c/140°f ~ 70°c/158°f)<br> white-medium temp (50°c/122°f ~ 60°c/140°f)<br> blue-lowest temp(40°c/104°f ~ 50°c/122°f)</p> <p><b>considerations</b><br> please do not use more than 5v input dc power to avoid security problems.<br> prohibit the use of products while sleeping.<br> not for pregnant women, young children and those who can not express their willingness.<br> not use for people with pacemakers.</p> <p><b>what is included </b><br> 1x heated vest with usb cord (no battery pack )<br> 1x user manual <br> 1x mesh laundry bag</p> <p><b>seller service</b><br> our heated vest effectively warm your torso. please feel free to contact us if you meet any issue of size, heat, operation and quality. we will provide satisfying service to you</p>