1. Safety & Intelligent: Heated vest designed with the latest carbon fiber and imported high-quality heating sheet for quick heat up. If up, it would stop running until the heat returns to the standard operating temperature. Help to promote blood circulation and relieves muscle pain. 2. 9 Heating Zones& 3 Temperature Control: Heated vest qualified carbon fiber heating elements with 3 heating levels to generate consistent heat for 9 core body parts, including your neck, back, abdomen, and waist, helping to maintain body warmth, promote blood circulation. 3. Premium Skin-Friendly Fabric& Lightweight: This Heating Vest is made of lightweight carbon fibre, windproof and waterproof, machine and hand washable. Comfortable and smooth to touch, warmth to last all winter without the bulk of heavy coat. 4. Compatible USB Powered: USB plug is compatible with most power banks in the market with output of 5V, which enables quick smooth electric warmth without radiation. 5. Elastic Design & Unisex Style: Heating jacket with elastic band design, it will fit you better and more comfortable to wear. Bilateral pockets design is convenience to store your cell phone, card, key etc, which is great for all kinds of winter sports or outdoor activities, like hiking, skiing, cycling, fishing etc. Specification Material: Polyester Color: Black, Red, Blue Size: S, M, L, XL, 2XL, 3XL, 4xl Weight: 351 g, 366 g, 371 g, 395 g, 401 g, 432 g, 443 g Voltage: 5 V Working Time: 8 hours Package Include: 1 Heated Vest