•Improve the cold feet, carbon fiber material heat, effectively stimulate the blood circulation of the feet, help to resist the cold weather •Charging fast with a long time, charging 4 hours, using 10 hours •Suitable for outdoor work crowds, winter travel essentials, old, cold, and afraid of cold people Operation of the button on the insole: •Press and hold the on button for 3 seconds before putting in the insole, the LED indicator light will be on and the red light will be on, indicating high temperature •Tap again, and the LED blue light is on, indicating medium temperature •Tap again, and the LED green light is on, indicating low temperature. Tap to cycle the red, blue and green lights, high school low temperature three grade adjustment, and long press three seconds to turn off Specifications: •Charging voltage: 5V1A •Charging current: 400mA 7.4WH •Operating voltage: High-grade: 4.2V 547mA 3.85V 505mA •Battery capacity: 2100mAh •Heating cloth: 10 x 6cm •Load impedance: 8Ω •High temperature: 55°C, use time 4 hours •Medium temperature: 50°C, use time 6 hours •Low temperature: 40°C, use time 9 hours Package included: •1Pair x Heated Insoles •1 x Charging Cable •1 x Remote Control •1 x English Manual