Feature 1. Safe and intelligent: The heating vest is designed with the latest carbon fiber and imported high-quality heating elements, which can quickly heat up. If started, it will stop running until the heat returns to standard operating temperature. Helps promote blood circulation and relieve muscle pain. 2.9 heating zones and 3 temperature controls: The heating vest is equipped with qualified carbon fiber heating elements with 3 heating levels, which can generate continuous heat for 9 core body parts such as the neck, back, abdomen, and waist, helping to keep the body warm and promote blood circulation. 3. High quality skin friendly fabric, lightweight: This warm vest is made of lightweight carbon fiber, windproof and waterproof, machine washable and hand washable. Comfortable and smooth to the touch, no need for heavy coats, keeping warm throughout the winter. 4. Compatible with USB power supply: The USB plug is compatible with most power sources on the market, outputs 5V, and can achieve fast and stable heating without radiation. 5. Elastic design and neutral style: A heated jacket with elastic band design will fit and be more comfortable to wear. The double-sided pocket design is convenient for storing mobile phones, cards, keys, etc., making it perfect for various winter sports or outdoor activities such as hiking, skiing, cycling, fishing, etc. Specification Material: Polyester Color: Black, Red, Blue Size: S, M, L, XL, 2XL, 3XL, 4xl Weight: 351g, 366g, 371g, 395g, 401g, 432g, 443g Voltage: 5V Working Time: 8 hoursPlease note that this product (excluding portable power banks) requires a self-contained power supply that is compatible with most power sources on the market