100% brand new and high quality LCD Screen display Clock function Measuring temperature by two sensors In/out Dual-way temperature measurement Used widely, such as in air-condition, icebox, icehouse, car and house Parameters: Temperature range: -50C~70C(No F, only C) Resolution: higher than-20C, 0.1C, no more than -20C,1C Power: 1 piece of 1.5V LR44 (not included) (not included) Size: 5.6X4.0X1.2cm(approx) Sensor wire length:90cm(approx) Operational Instructions: Switch between in and outside temperature measuring When press key(FSW)to measure inside temperature and the LCD will display IN. Press key(FSW)again to switch into outside temperature measuring and the LCD will display OUT. Clock Function setting Press key(FSW)to switch LCD into clock display. Press key(HR)to adjust Hour and if pressed more than 2 seconds, it will be adjusted quickly. Press key(MIN)to adjust Minute and if pressed more than 2 seconds, it will be adjusted quickly. Power On/Off Press(FSW) 4 seconds to turn off the machine Press key(FSW)to turn on the machine Operational Instructions: Switch between in and outside temperature measuring When press key(FSW)to measure inside temperature and the LCD will display IN. Press key(FSW)again to switch into outside temperature measuring and the LCD will display OUT. Clock Function setting Press key(FSW)to switch LCD into clock display. Press key(HR)to adjust Hour and if pressed more than 2 seconds, it will be adjusted quickly. Press key(MIN)to adjust Minute and if pressed more than 2 seconds, it will be adjusted quickly. Power On/Off Press(FSW) 4 seconds to turn off the machine Press key(FSW)to turn on the machine