Features: 1,Cut to Size from 36 to 46(European Size).Easy to adjust to the right size.Both sides are available, not distinguish between right and left foot 2,The latest improvement, two kinds of power supply mode, you can use USB cable to connect mobile power, or you can put 3 x AA battery into the battery case ,a total of 6 x AA battery.( Battery and Power bank are not included ) 3,soft EVA material 4,Max Temp:42 Degree 5,Insoles connected to battery pack contained inside mesh fabric pouch which securely fastens around leg with strap 6,Simply trim to fit 7,Perfect for the winter 8,Color:Black 9.The latest design.2 USB cable can be connected to power bank or computer.(Power bank is not include) Technical specifications: • Two insoles, can be cut to fit shoe sizes 36-46 • Voltage: 4.5 Volt • Power: 1.8 Watt • Cable length: 43 cm;usb cable length is 120 cm. • Made from: EVA-foam (thickness: 0.48 cm), synthetics, metal Package Included: 1x pair of Heated Insoles 2x battery cases 2x battery bag 2x USB cable Additional operating advice: • Do not use more than one insole per shoe. • Do not bend the insoles. • Ensure that the cable is correctly plugged into the battery case and that the pockets are closed properly. • The ankle straps should be fastened tightly around the legs.