Features   PRINCIPLE: This product uses thermoelectric refrigeration components to achieve refrigeration, in a special semiconductor through direct current generated low temperature conduction to the cartridge, and by the radiator through the fan to the external heat dissipation. REFRIGERATION TECHNIQUE: Semiconductor of the coller case with quick refrigeration technology, stable performance, long life, low noise and no pollution. LED DISPLAY: Adjust temperature from 0 to 18 degree centigrade, LED display can observe the temperature, battery power, fan working status in real time.   ELECTRONIC: The use of the new touch digital keys, more easy and simple to press, digital screen viewing more intuitive, easy for the elderly use. ALARM: With alarm reminding system, when the case power is insufficient, the refrigerator box will intermittently buzzed alarm, reminding the user to replace the battery in time, charging and so on. POWER SUPPLY: USB cable connection adapter, charging bank, car USB interface, lithium battery can be powered, the battery with rechargeable and reusable. WIDE APPLICATION: Travel, home, office, vehicle, pharmacy, hospital and other places can be used to provide convenient medication services for diabetic people.   Specification     Material: ABS, acrylic, electronic components Battery: Matching lithium battery, NCR18650B, 10600mAh, 5V   Temperature adjustment range: 0 to 18 degree centigrade Rated power of the host: 10W when connected to external power supply, 5W when connected to battery   Cold room size: Approx. 185 x 101 x 43mm / 7.28 x 3.98 x 1.69in   Power supply: USB cable adapter, charging bank, car USB interface, lithium battery, etc Applicable place: Travel, home, office, vehicle, pharmacy, hospital and other places   Principle: This product uses thermoelectric refrigeration component, namely semiconductor to achieve refrigeration, in the special semiconductor through direct current to produce low temperature conduction to the box, and by the radiator through the fan to the external heat dissipation.     Use method: 1. Power on: External power supply: when there is no built in lithium battery in the host, switch on the power adapter or USB power supply, the machine will beep a di, indicating that it has been powered on, and the machine automatically detects whether the battery is installed, if there is no battery, the screen displays the full battery. Battery power supply: when the external power supply is not connected and the built-in lithium battery is directly connected, the machine will beep a sound, indicating that the battery has been connected, and the screen will not display. Internal and external power supply at the same time: when the battery has been connected to the case, when connected to the external power supply, the screen will display the power indicator, and detect the power, such as the battery is fully charged, the battery display full, such as the battery is not full, display the corresponding power and charge at the same time. 2. Switch machine: Startup: press the power button for 1 second after startup. After a beep, the screen lights up.