. HEATED SHOE INSERTS USB 41-45 2. Safe and durable heat: using 2 2100mAh batteries (included) can provide up to 8 to 10 hours of long-lasting heat. 3. DIY cutting: there is a cutting line, DIY inserts human design, the size can be cut at your discretion, do not worry about redeeming the size of the problem. 4. Ultra thin insole: thin and comfortable, not choking feet, thin up to 0,5 cm at the front, 2 cm in the heel, without the feeling of a foreign body. 5. Application: Suitable for sports shoes, leather shoes, shoes, snow boots, etc. Suitable for outdoor use, motorcycle, skiing, fishing, travel, camping. . HEATED SHOE INSERTS USB 41-45 . HEATED SHOE INSERTS USB 41-45 Material: microfiber cloth Insert battery: 2 x 2100 mAh lithium polymer batteries (included) Battery for remote control: 1 x 23A Battery 50mah (included) Charging Voltage: 3 V-4,2 V Power Output Capacity: 98% Weight: 12,6 to 13,5 ounces. HEATED SHOE INSERTS USB 41-45 . HEATED SHOE INSERTS USB 41-45 1 x Remote Control 1 x Data Cable 1 x User Manual. HEATED SHOE INSERTS USB 41-45 . HEATED SHOE INSERTS USB 41-45