1. Environmentally friendly materials: safe and environmentally friendly materials, the latest high-efficiency carbon fiber heaters. High-density, built-in safe 1900mAh Li-polymer battery. The circuit battery is protected by a steel shell, which has a strong load-bearing capacity.2. Temperature adjustment: high temperature mode 2-3.5 hours (53-60), medium temperature mode 3.5-5.5 hours (48-52) - low temperature mode 5.5-9 hours (40-50) (depending on environmental conditions).3. Easy to use: Wireless remote control for maximum comfort.4. Cuttable: Can be cut to the right size, can be adjusted according to your shoe size and the sole can be trimmed to meet your needs, ranging from 35-40Eurosize, to 41-46Eurosize.5. Keep feet warm: solve the discomfort of feet in cold weather. Keeping you active during certain winter activities such as hunting, skiing, motorcycling, mountaineering or walking etc. is simple and easy to use. Heated insoles with remote-controlled foot warmers for huntingSpecification:USB chargingVoltage: 3.0V-4.2VBattery capacity: left: 2100Mah, right: 2100MahInput: AC/100-240V, 40-60HZOutput: 4.2V-5VService life: more than 500 timesYardage:Mcode:35-40EurocodeLcode:41-46EurocodePacking list:1 pair of insoles1*remote control1*charging cable1*Instruction manual" 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.