Heating Mode.
The initial color of the LED light indicates the present charging status of the battery:
RED indicates that the battery is fully charged.
YELLOW indicates that the battery is halve charged and
GREEN indicates a low battery level and that the battery should be charged before use!
The temperature can be adjusted by pressing and releasing the keypad control button.
L - Green LED (34°C-39°C with approximate heating time of 4 - 5 hours)
M - Yellow LED (39°C-44°C with approximate heating time of 3 - 4 hours)
H - Red LED (44°C-50°C with approximate heating time of up to 2 hours)
Please note that the actual heating time always depends on the outside temperature . The Li-Ion batteries reach its full power after having been fully charged and fully drained several times! Additional batteries packs can be purchased separately
if extended heating times are needed!
Turn OFF the socks by pressing the ON/OFF keypad control button several seconds until the LED light turns off. Always unplug the batteries when the socks are not in use and store them inside the pouch of the Socks
The high-quality 5V 4000 mAh Li-Ion Polymer Batteries (no memory effect!) cannot be damaged by frequent charging and can be re-charged approximately 500 times!

Specifications:
*Material:Cotton and Spandex 
*Size: Free size:24cm-27cm,unisex
*Heated area:Forefoot, and toes and Soles of the feet. 
*Use condition:Lasting for 5 hours 
*Color:Gray (same as Picture)

Package Included:(Without Retail package)
*1 x heated socks
*2 x Batteries 
*1 x AC Charger