1, Safe and environmentally friendly materials, the latest high-efficiency carbon fiber heater; high-density, built-in safe 2100mAh lithium polymer battery. The circuit and battery are by a steel case with high bearing capacity.2. Temperature adjustment - high temperature mode 2-3.5 hours (53C-60C), medium temperature mode 3.5-5.5 hours (48C-52C) - low temperature mode 5.5-9 hours (40C-50C) C) (depending on conditions)3. Simple to use - Wireless remote control maximizes operator comfort.4. Cut to fit - can be adjusted to your shoe size, trim the to fit your needs, range 34-40 ohm and 41-45 ohm5. Keep Your Feet Warm - Rechargeable battery heated insole can solve your foot discomfort in cold weather. Keep you active in certain winter activities such as hunting, skiing, motorcycle, mountain climbing or walking etc. Simple operation Easy to do.1, Parameters Charging voltage: 5V1A Charging current: 400mA 7.4WH2, Discharge current: high-grade: 4.2V 547mA 3.85V 505mA3, Working voltage: 3.85V/4.2V4, battery and control module, battery: 2100mAh5, Heating cloth: 10x6cm Load impedance: 8 ohms6. Working discharge time: high temperature 100%: 4 hours and 30 minutes around 55 degrees, medium temperature 75%: around 50 degrees in 6 hours, low temperature 40%: around 9 hours and 40 degreesColour:blackMaterial:Rubber + mesh surfaceSize:35-40 yardsPackage Contents:1 pair X heating insole1 X remote control1 X Charging Cable1 X English manualOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. 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-Minnanxin