Description Color: Dark Gray Material: Neoprene fabric Input: 5V Rated voltage: 5V Rated power: 7W Battery type: Rechargeable lithium-ion cell Battery model: 18650, 3.7V Battery capacity: 1800 mAh Charging time: Approximately 3 hours Use time on a full charge: Approximately 3 uses, 30 minutes each Tested on a full charge, using the highest setting. Usage time and number of uses: Heating only: 3 uses = 90 minutes Vibration only: 10 or more uses = approximately 300 minutes Heating + vibration: 3 uses = 90 minutes Charging :Displays LL when charging, HH when charged, and a green light. Timer: Default: 30 minutes Neck brace unfolded dimensions: Approximately 64cm/25.2 inches long, approximately 14cm/5.51 inches wide at its widest point Net weight: 154g Features 1. Wireless design offers portability and freedom from cables, allowing you to enjoy hot compress therapy anytime, anywhere. Perfect for those who spend long periods looking down at their phone to relieve neck fatigue. 2. Constant temperature heating quickly penetrates the neck, effectively relieving shoulder pain and muscle stiffness, promoting blood circulation and enhancing comfort. 3. Ergonomically designed to fit the neck curve for a secure and comfortable fit, with adjustable tightness to meet the needs of various users. 4. Safe, eco-friendly, breathable material that is skin-friendly and reusable, and hygienic. 5. Multifunctional design combines massage and hot compress functions with one-touch operation, making it suitable for home, work, and travel. Package included: Electric heating neck guard*1