Feature: High conversion efficiency, energy saving, the average hour with one degree of electricity.Easy to cut to the size you need. Applicable to various shoe types.Make your foot more comfortable and warm.Removable design, convenient and clean.USB charger,connected to PC, laptop,charger, keep your feet warm indoor.Specifications:Product Name: USB insolesTemperature: about 40 - 50Voltage: 5V/2AOptional dimensions: 41-46 Material: EVAcolour: blackPackage Contents:1 Pair x Electric Heating Insoles1 x USB CableOnly 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.