Specifications: 
Color: Black/ Grey/ Brown
Sock's Material: Cotton&spandex
Sock's Size: Free size,fits for women and men
Heating Area: The bottom of foot

3 Levels Heat Setting: 

(1) High Setting: Red light, heating 3-3.5 hours;
(2) Medium Setting: Orange light, heating 4.5-5 hours;
(3) Low Setting: Green light, heating 6-6.5 hours.

Package includes:  
1 pair of heated socks
1 pair of li-ion batteries
1 AC charger
1 elegant present box
1*using manual
Washing Issues: Hand wash and soft wash.

How it Works: 

Simple steps to enjoy suitable warmth:
After connect to the batteries with wires which located in the sock's pocket.
Step 1: Press the ON/SETUP/OFF, then it is Red light (100% heat).
Step 2: Press the ON/SETUP/OFF again, then it is Orange light (75% heat).
Step 3: Press the ON/SETUP/OFF again, then it is Green light (50% heat).
Step 4: Press the ON/SETUP/OFF again, then the light close and it will not heat.
We recommend you set the temperature setting at High (Red) at first 5-10
minutes. And then change to set it at Setting- Medium (Orange)/ Setting Low(Green) and you will feel fine.

Warm tips: 

Tips 1: Need to charge all 2 batteries fully about 12 hours for the first time use
cause the li-ion battery may not come full or may be out of power due to long
term transportation.In every subsequent use it takes 4-5 hours for full charged.

Tips 2: Please charge 2 batteries at the same time.

Tips 3: The charger light will turn red to green after the battery are fully charged.

Tips 4: Hand wash and soft wash would recommend cause machine wash would
damage heating elements.

Tips 5: To avoid skin burns at high temperature, after you feeling warm,please turn off the heating when sleeping.