The MOBILE WARMING Bluetooth enabled 7.4-Volt Men's Peak BT Heated Vest is ready for all conditions, rain, wind, cold, perfect as a heated outerlay over a shirt, or when conditions get really cold, use as an effective heated baselayer under your current jacket. Great for hunting, fishing, skiing, hiking, or working outdoors. Stay dry with our windproof and water resistant Windshark softshell construction. Stay warm with an integrated lithium ion powered, 7.4-Volt heating system that delivers instant heat for up to 10-hours at 4 different temperature settings. The Peak Vest features our exclusive Bluetooth enabled integrated touch control button allowing you to control temperature and view battery life right from you cell phone. Especially useful when used as a baselayer beneath your jacket. Size: Large. Color: Black. Gender: male. Age Group: adult.