What's in the box:

1 X Wireless Battery Heated Socks Electric Rechargeable Heat Socks Kit Motorcycle Hunting Skiing Cotton Thick Thermal Socks Battery Powered Warm Socks (Black), Black

Features:
Carbon fiber heating elements & heated quickly. You would feel the heat within 1 minute.
2 rechargeable batteries (4-8h duration) and 2 invisible battery pockets, so you can wear them in both indoor and outdoor activities.
More powerful to accelerate blood circulation and keep your icy feet warm.
Adjustable temperature (35-55?/95-130?) with 3-gear heat settings.
Made of cotton & spandex, enhanced heel and toe design prolongs socks life and add comfort for you.
Package includes 2 rechargeable Li-ion batteries.
Perfect foot warmer for outdoor sport like motorcycle, hunting, skiing, ice-fishing etc.

Specifications:
Material: Cotton & Spandex
Color: Black / Grey (Optional)
Size: Free Size
Battery: 2 * 3.7V / 2200mAh rechargeable li-ion battery (Included)
Charging Time: 3.5h
Duration: 4-5h
Temperature: 35-55?/95-130?
Heating area: Sole
Washing: Washable
Fit people: Most men and women
Weight: 280g / 9.9oz

Package list:
1 * Pair of Socks
1 * Pair of Rechargeable Batteries
1 * USB Cable

Remarks:
Hand wash & soft wash would recommend.
Very easy for your use with following steps: Charge the batteries; Put on socks; Connect the batteries with wires; Switch ON button, the socks will heat up immediately.