Specifications: Heat vest for outdoor sports and leisure uses Protect your body from the cold elements with alaska heat vest. No more worries about the harsh winter weather. Alaska heat vest is the wise choice for you and your family. * features - 3 adjustable temperature settings - rechargeable battery pack lasts up to 12 hours in green mode(lowheat setting) and 6 hours in red mode(highheat) - infrared emitting heating pads for improved blood circulation - DC power source: No electromagnetic waves - made of neoprene(divingsuit material): Light-weight, superior insulation, waterproof and windproof - contoured fitting for minimized heat loss * suggested uses A) sports and recreation - for(ice)fishing, skiing, hunting, golf and other outdoor activities B) police forces - police force members of all regions and provinces C) military forces - for soldiers as mandatory uniform to keep them warm D) government agencies - transportation, road service, ambulance service, disposal service, and other on-site government employees spending majority of their time outdoors E) elders - older generation with medical requirements for secure retention of body heat F) general public - for people who are not accustomed to the cold weather Vest,2 heating plates, battery, charger * specifications: Model no. Alaska105 < contents > < specification > A) vest neoprene - diving suit material(waterproofwindproof) Weight:290g(small size) to 330g(xl size)/ea, color: Black or navy blue. B) 2 heating plates Flat&flexible type, carbonfilm weight: Small size - 20g, big size - 30 g The surface temperature can go up to 60 degrees(red mode/high heat setting ), effective temperature is about 50 degrees(orange mode/average heat setting) C) battery pack Model no. M44a(dual type). Lithium-ion(74v,4400mah) Recommended temperature in use 1) charging:0degree to 40 degrees 2) in use: -20 degrees to 50 degrees Weight:230g/ea. Size:87 x 76 x 23(unitmm) Battery life: More than 500 full charges Battery working time:6 hours(redmode) to 12 hours Mode) Battery pack contains 4 battery cells manufactured by Samsung electronics Co., ltd D) charger Model no.205a, lithium-ion battery charger Input voltage: AC 100v to 240v,50/60hz Rated voltage and current:7.4v DC 1000ma Weight:200g/ea, recharge time:4 hours and 30minutes