No. You will not notice any of the internal circuitry as allparts and wires are well designed and sewn to blend in with the fabric of the jacket.

No, the highest working temperature is set at 55°C.(131°F), 

No, the Thermal-Electric Jacket is embedded with a high-tech protection circuit inside. It will stop working if there are any unexpected circumstances.

The power bank’s duration depends on the capacity of your power bank and the temperature setting you choosed. The following table is the duration of the power bank that we used to test our heated jacket(20000 Mah Mi power bank):

And different brands have different life times, most of the power bank can be used more than 1000 times, which means it can be used for more than 3 years.

It provides three temperature Settings, green represents the lowest temperature of 35 to 45°C (95-113°F); blue for the medium temperature of 45 to 50°C (113-122°F); Red represents the highest temperature of 50 to 55°C (122-131°F).

We’ve done a lot of trials on our products, It proves that our products can work properly in water and will not harm to the fish. And our products have been approved by FCC and CE, so you can safely use our products.

Our heating system is made of composite carbon fiber, which is very durable and can be used more than 3,000 times, and we also provide you three years of quality assurance service.