The SAFIT Smart Heating Best application provides a function for the user to select and control the temperature of the heating pad using a smartphone.1) Specification - Operating system: Android Jelly Bean (4.3) or higher / IOS 10.2 or higher - Environment: Bluetooth 4.0 / USB 2.0 or higher - Temperature sensor measuring range: 45℃ ~ 120℃ - 4 stage set temperature: 40℃ / 45℃ / 50℃ / 55℃ - Smartphone controllable distance: about 10M - Power: 5V 2.1A or less / Auxiliary battery for smartphone charging (All models are compatible) - Available time: About 10 hours at the lowest temperature / About 6 hours at the highest temperature (Based on 10,000mAh and may varyn depending on battery performance and environment)2) Setting method ⓛ Smartphone APP installation ② Connect the heating pad USB module to the auxiliary battery ③ Run the app3) function 4-step temperature control is possible. The ON / OFF icon is a function that temporarily cuts off the power, and the heating function is temporarily stopped.4) Avoid direct contact with the skin before use. Red spots may appear depending on the skin when used for a long time at high temperatures. In this case, stop using it immediately and consult a professional.The SAFIT Smart Heating Vest Pad is a hardware developed for the purpose of providing temperature.Compatible with all models of auxiliary battery for charging smartphones,You can control the temperature using its own button without a smartphone.