1. Fast heating: The pocket USB heater heats up in 3 seconds and reaches optimal warmth within 30 seconds, maintaining a consistent temperature range of 45 - 60 degrees Celsius to keep you warm. Ergonomically designed for comfort, it fits easily in the palm of your hand and can be conveniently carried 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. Compatible with various power sources such as power banks and vehicle chargers, ensuring reliable performance on the go. 3. Compact and portable: This rechargeable hand warmer is lightweight and compact, designed for easy handling without occupying much space. Its portable size makes it simple to carry and use anywhere. Product dimensions are approximately 99mm (3.9 inches) in height and 40mm (1.6 inches) in width. 4. Gift option: This electric hand warmer makes a thoughtful gift for family and friends, offering warmth during cold weather. Styled with a design resembling headphones, it is both fashionable and functional, suitable for personal use or 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, ideal for use during travel, at the office, home, school, and other everyday environments. Choose a practical and stylish hand warmer to enhance comfort in chilly conditions. Specifications: Project Type: Electric Material: ABS, aluminum alloy Battery type: Lithium-ion battery (built-in) Battery capacity: 3000mAh Height: approx. 99mm / 3.9 inches Width: approx. 40mm / 1.6 inches Extension arm size: approx. 65mm / 2.6 inches Maximum distance between earcups: approx. 79mm / 3.1 inches Instructions: 1. Press and hold the power button to turn on the hand warmer. Click the button to switch between two heat settings: 60°C (high) and 45°C (low). 2. Use the charging cable to connect the device to a power source via the input interface for recharging. Packing list: 1 x Electric hand warmer 1 x Charging cable