Upgraded design:1. Built-in 2x3 large airbags can massage the calves, arms and feet like a kneading massage with both hands.2. 2 heating levels. low and high temperature. Effectively warm your cold legs, promote blood circulation and reduce leg fatigue.3. Small and light: no complicated trachea and bulky controller.4. Easy and fast charging: It takes about 2.5 hours to fully charge and can support about 3 hours of continuous use.5. Use anytime, anywhere. No matter where you are, whether you are sitting or standing, it will not disturb you.6. Each leg is attached with its own controller, so you can use them both at the same time or just one leg if you want.Specification:* Charging voltage: AC 100V~240V/ DC 5V 3A* Battery capacity: 2500mAh x2