The Volvic Tech Warming Vest is a smartphone application that allows you to select the temperature of the heating pad step by step and automatically adjust the temperature of the garment to keep it at the desired temperature.Basic functions and operating environment- Step-by-step temperature control of heating apparelThe temperature displayed in the application is measured by the temperature sensor built into the heating pad.It is the temperature value, and the value measured after wearing the garment is the temperature including the heat insulation.- Operating system: Android 4.3 Jelly Bean version or later Environment: Bluetooth 4.0 / USB 2.0 or higher RED LED: Four stages (40, 45, 50, 55 ℃) BLUE LED: Bluetooth connection confirmation indication Smartphone controllable distance: 10M Temperature control with USB module switch without smartphoneClothing purchasers with exclusive heating pads provided by Volvic Techware can use the following methods.1. Prepare the Volvic Tech product you want to connect near your smartphone.2. The bluetooth of the smartphone should stay on and it is connected automatically by searching for the Volvic Tech.3. If there are more than two products nearby, select the desired product from the Bluetooth item.4. When the product connection is completed, the temperature control screen is displayed. The temperature can be adjusted in four steps.5. Even if the Bluetooth connection is disconnected, the heat will continue at the last set temperature.6. It has a jogging function and can be used selectively as needed.[Notice]- When adjusting the temperature, first set the lowest temperature at 40 ℃ and set the temperature according to your body temperature and ambient temperature.- Battery capacity is 10,000mAh, it can be used for about 12 hours when set at 40 degrees, and about 6 hours when set at 55 degrees (depending on the ambient temperature).