Specification Product name Electric Heat Vest Clothes Warm Vest Men Heating Coat Jacket For Skiing CampingMaterial PolyesterFiller CottonWeight approx 350gGender MenVoltage 5VSize M L XL 2XL 3XL 4XL 5XL optional Color Camouflage bluePower supply Power bank not included you need to prepare or buy one Temp Control 45 35 25℃Fiction Intelligent charging heating USB Charging Temp controlSuitable season Autumn WinterApplicable scenes Running hiking camping cycling sports Feature Made from high quality polyester material which is not only durable but also practical Smart heating vest possesses both a humanized heating design and a casual style Built to greatly strict quality control standards resulting in its stable performance Excellent quality fabric and cotton is very comfortable and soft to touch and wear When worn it can be more fit to the body because of its elastic fabric which is of warmth and comfort Three speed temperature adjustment one button heating intelligent heating suitable for wearing in various temperature environments Suitable for everyday wear light outing wild fishing mountain climbing camping and other outdoor activities How to use 1 Remove the USB plug to access the charging power bank press the charging power bank output switch long press the chest temperature control switch for 2 seconds 2 The red light flashes it is automatic temperature control heating After the red light flashes for 5 minutes the automat