*Electric heating insole lithium battery rechargeable remote control constant temperature heating three-speed temperature adjustment cold protection and warmth *Specifications*Material: plastic plus carbon fiber; color: red and black; size: 26*9*5cm; M size: suitable for 35-39 shoes; L Size: suitable for 40-46 shoes; weight: 297g; package size: 5*11*32cm; voltage: 3.0V-4.2V; battery capacity: 2100mAh; input: AC/100-240V40-60Hz; output: DC/4.2V -5V 500*2; Charging time: 4 hours; Use time: about 10 hours; *Package list 1* Electric heating insole (with built-in battery) 1* Remote control 1* Double head USB charging cable *Features*1. This heating The insole is designed with a mesh surface, which is breathable and sweat-wicking, suitable for the foot shape, and can be used easily without leggings. *2. Built-in lithium battery, carbon fiber material heats up, it can be heated continuously for about 4-8 hours, the warmth retention is very good, even if it is minus ten degrees, it will not feel cold. *3. Three adjustable temperatures: low-grade 40, mid-grade 50, high-grade 55, to meet the needs of different groups of people. *4. It can improve the coldness of feet, effectively stimulate the blood circulation of feet, and help you resist cold weather. *5. Suitable for those who work outdoors, the elderly, those who are afraid of cold, those who like outdoor sports or travel in winter. *Due to different measurement methods, please allow 2-3cm measurement error. *Due to the problem of shooting tools and light, please allow the color difference between the picture and the product.