Features: 1. Usage: Press and hold the button for 3 seconds to power on the device. High temperature mode outputs 100% voltage – indicated by red light. After 5 minutes, it automatically switches to medium temperature – indicated by green light. Press the button to cycle through high, medium, and low temperature settings. Press and hold the button for 3 seconds to power off. 2. Easy and convenient to use. Can be placed inside jackets, vests, and other clothing for warmth. Operates with a 5V 2A power source such as a computer, power adapter, or power bank (not included). 3. Application: Suitable for use in clothing, vests, waist areas, abdomens, and for pets. Avoid sewing over the central heating wire. Maximum temperature is 55°C (131°F). Foldable and moderately water-resistant. Heats evenly and is washable; however, do not soak in water for extended periods. (The fabric layers are bonded with adhesive, and prolonged soaking may affect adhesive integrity.) 4. Lightweight and portable, ideal for outdoor activities such as camping during winter. Also suitable for individuals sensitive to cold, providing effective personal warmth. 5. Do not use on infants, individuals with reduced sensitivity to heat, or those unable to operate the device independently. Do not use in wet conditions; ensure the device is completely dry before use. Do not operate unattended. Note: There may be a 2–3% variation in dimensions due to manual measurement. Please review the measurement chart before purchasing. Product Material: Carbon fiber heating cotton thread Size: 12 x 8 cm / 4.7" x 3.4" Thickness (3pcs): 2 mm Thickness (8pcs): 1 mm Quantity: 3 pcs/set or 8 pcs/set Rated Voltage: 5V Rated Power: 8W Normal Temperature Resistance (3pcs): 15Ω Normal Temperature Resistance (8pcs): 2.5Ω Maximum Temperature: 55°C (131°F) Three Indicator Lights: - Red Light (High Temperature: 55°C) - Blue Light (Medium Temperature: 50°C) - Green Light (Low Temperature: 45°C) What You Get: USB Electric Heating Pads (as selected)