Want to charge both of your ThermaCELL Original Heated Insoles at once? Buy a Replacement Wall Charger, and you can do just that! This advanced charging technology has overcharge protection and an input range of 100V-240V. This charger is the same as what originally came with your ThermaCELL Original Heated Insoles. You may use multiple chargers, but it is not needed to use your Heated Insoles properly. The charger will not come in packaging.