Surface material: velvet insoles battery capacity: 2000mAH insole battery voltage: 3.7V Operating voltage range: 3.0 v-4.2 V Charging cut-off voltage: 4.2V Discharge cut-off voltage: 3.0v Battery life: over 500 cycles Charging method: constant current constant pressure (CC/CV) : charging temperature 0 ℃ ~ 45 ℃ Input: AC/ 100-230v 40-60hz Output: DC/4.2V 500mA*2 Temperature control mode: High-grade (H) : 1. The boot after high temperature can reach 55 ℃ to 62 ℃, use time about 3.5 to 4.5 hours. 2. Intermediate (M) : after startup intermediate temperature up to 48 ℃ to 55 ℃, using time about 5 to 6 hours. 3. Low (L) : boot after low temperature up to 39-46.2 ℃, the using time is about 6.5 to 7 hours. Optional color: black, red, blue
