1. Material: This electric down vest is made of 80% filled silk cotton material, which is wear-resistant, easy to clean. It is made of light and soft material, suitable for shirts and under any thick coats or jackets without being noticed. Suitable for general outdoor and daily use. 2. Level 3 temperature adjustable: 9 Heating Zone Level 3 temperature (25 ,35,45 ) is intelligently adjustable and used in various locations. Adjusting the temperature of the optimal heating system according to the ambient temperature is very suitable for winter. The outer layer is durable to make the Jacket windproof, and some lightweight insulating fabrics are used inside to keep the coat comfortable and soft. 3. 5V USB Charging: The heating jacket Charging precautions: 5V non-inductive voltage (use your charging treasure to charge better heat effect,not include charging treasure), no electromagnetic radiation, energy saving and environmental protection,Connect the charging treasure, press and hold the switch for 3 seconds to charge and heat. 4. Occasions: The outer layer is durable to make the vest windproof, and some lightweight insulating fabrics are used inside to keep the vest comfortable and soft. and the heated vest helps promote blood circulation and relieve muscle pain. It is very suitable for walking your dog, skiing, hiking, motorcycle, climbing, sports, camping, fishing, and even keeping warm in the cold winter.