[Up to 11 Hours Of Heating] Upgrade heated insoles battery to 3300mAh for longer lasting heating time (up to 11 hours) The heated foot warmer can be charged 500 times and safely used even at -20 C [5 Seconds Rapid Heating] The heat insulators are made of soft velvet upper and last carbon fiber heating material, using the 5th generation chip for fast heating (5 seconds fast heating), suitable for outdoor, motorcycle, skiing, fishing, travel, camping [3 Temperatures Setting] The heated core has 3 temperature settings (Low, Med, High), operated by remote control, the temperature range from 104 F/40 C to 149 F/65 C High heat mode approx 6h, med heat mode approx 8h, low heat mode approx 11h (Also depending on environmental conditions) [Safety Protection System] The heated foot heater built in temperature sensor and safety control chip, the temperature will automatically stop heating when the safety temperature is reached, the circuit and battery are protected by a special plastic case, can be carried about 200KG [Cut To Fit Size] The electric heated insulators can be adjustable to your shoe size, trim the soles for the perfect fit following the size guide If you have any questions please leave us an email on the user manual, we will respond within 24 hours PLEASE REST ASSURE TO BUY! Package: 1 Pair Heard Insights Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia