1. Fast heating: The pocket USB heater warms up within seconds and maintains a consistent temperature range of 45°C to 60°C to provide continuous warmth. Ergonomically designed for comfortable handling, it fits easily in the palm of your hand or in your pocket.2. Temperature display: Upon powering on, the device displays the current temperature, showing 60 at high heat and 45 at low heat. It features a built-in 3000mAh lithium-ion battery for extended use. The heater can be charged via power banks, vehicle chargers, or other standard USB power sources.3. Compact and portable: This rechargeable hand warmer is lightweight and small in size, making it easy to carry and use anywhere. Designed for convenience, it fits comfortably in pockets and takes up minimal space. Product dimensions are approximately 99mm (3.9 inches) in height and 40mm (1.6 inches) in width.4. Gift option: A practical and thoughtful gift for family and friends, ideal for keeping warm during cold weather. The sleek, headphone-inspired design offers a modern look and can serve as a decorative accessory.5. Soft-touch finish: The side arms are made with a soft, durable material that feels comfortable in hand or when carried in a pocket. Rechargeable and versatile, suitable for use at home, in the office, at school, or while traveling. Choose a stylish and functional hand warmer to enhance comfort in daily life.Specifications: Type: Electric hand warmer Material: ABS, aluminum alloy Battery type: Built-in lithium-ion battery Battery capacity: 3000mAh Height: Approx. 99mm (3.9 inches) Width: Approx. 40mm (1.6 inches) Extension arm length: Approx. 65mm (2.6 inches) Maximum distance between arms: Approx. 79mm (3.1 inches)Instructions: 1. Press and hold the power button to turn on the device. Click the button to switch between two heat settings: 60°C (high) and 45°C (low). 2. Use the USB input port to charge the device with a compatible power source.Package includes: 1 x Hand warmer 1 x Charging cable