Product SpecificationsTemperature measurement range: -40+70(-40+158)Use battery: 1.5V (AG10) 1 Basic functionsrefrigerator temperature displayHigh and low temperature automatic alarm function (default high temperature 28, low temperature 18)Arbitrary high temperature and low temperature alarm range can be set/ temperature switch displayLED lights indicate alarm How to operate1. Push open the battery cover in the direction indicated on the back of the machine, then replace the battery and battery cover, and the machine is ready to use.2. Button function:[SET] Set high and low temperature alarm range;[+]Increase the value of the set item;[-] Decrease the value of the set item;/Switch the temperature unit to display in (Celsius) or (Fahrenheit)3. In the initial state, the default high temperature alarm value is 28C, and the low temperature alarm value is 18C. (When the temperature is higher than the high temperature or lower than the low temperature, the LED light flashes to alarm.)4. Arbitrary high and low temperature alarm range setting: long press [SET] for 2 seconds, the "SET Hi" position value flashes, press [+]/[-] to adjust the high temperature value, press [SET] again, "SET LO" ." The position value flashes, press [+]/[-] to adjust the low temperature value; then press [SET] once to confirm the setting. Precautions1. If there is any defect in the machine, please remove the battery from the battery compartment and install it after 2 seconds.2. After the battery is used up, please put it back to the place designated by the government.3. Subject to technical changes without notice.