1、High-quality Material: This heating stocking is made of 80% cotton, 12% polyester and 8% elastic fiber material, so it is absorbent, breathable, quick-drying, and elastic.
2、Suitable Occasions: Focusing on the toes to prevent the feet from getting cold, which can promote blood circulation. Apply to arthritic feet and long-term cold feet and stiff joints, giving you a warm winter.
3、Heating Piece: The heating piece is inside the sock. Specially designed battery pocket is safe and easy to carry.
4、Kit Including: One set has a pair of electric hot socks, two 3.7V2200MAH lithium batteries and two lithium battery chargers (US regulations). The battery needs about 4-6 hours to fill and can sustainable heat for 3-7 hours.
5、Rechargeable Heating Socks: Rechargeable lithium battery heating socks for cold weather projects or winter outdoor sports, winter ski hunting, camping cycling and motorcycles to keep warm.
Descriptions:
Button functions:
Three-speed thermostat Automatic Level Adjustment(preheating function)
1. After the thermostat is connected to the power supply (battery), the red, green and blue lights flash once. Long press the button for 2 seconds to start and enter the preheat mode, the LED shows red with breath flash. High output with output power of 100%, heating automatically changes to mid-level after 5 minutes.
2. Mid-level, LED light displays green, output power is 70%.
3. Low-level, LED light displays blue, output power is 40%.
4. Click to switch level button with three levels cycle, long press 2 seconds to shut down.
Specifications:
Name: 3-7 hours button electric socks
Heating part: heat on the back of the toe
Size: Free size (socks are elastic, can stretch)
Plug specifications: US regulations
Weight: about 400g
Packing size: about 23*10*5CM/9.06*3.94*1.97in
Battery: 3.7V 2200MAH lithium battery
Heating time:
High-level red light heating around 3 hours
Mid-level green light heating for about 4.5 hours
Low-level blue light heating for about 7.5 hours
Battery size: diameter is about 1.8CM/0.71in; height is about 6.5CM/2.56in
Charging time: The battery takes about 4-6 hours to fill
Packing List:
Heating Socks*1
2200MAH Lithium Battery*2
Lithium Battery Charger(USA Regulations)*2
Note:
It is recommended to wear thin socks and wear heating socks, so that the socks do not need to be cleaned every day. When cleaning, be careful not to rub the wires and heat parts. Do not put the plugs in the water. Please dry them before use, or put them into the washing machine to clean.

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Everything is very good for its price category, warm your toes and it's very good!!!
All is well, except that the socks are very tight. There is a possibility of damage when you put socks on your leg.
They are a Christmas gift, so that they have not been used yet. They look fine as far as I can tell.
Well arrived thank you to test for the reliability of this product but a defect store does not communicate damage