Indoor temperature range: -20~50°C / -4~122°F
Outdoor temperature range:-50~70°C / -58~158°F
Temperature accuracy: 0~50°C         ±1°C
<0°C or >50°C   ±2°C
Temperature resolution: 0.1°
Sensor wire length: 6ft.（1.8m）
Display size: 30×40mm
Digit height:12mm

Function brief
°C /°F Button: Press this button to set the temperature unit
Alert/Set Button: Press this button for more than one second, then press °C /°F Button to set OUT (outdoor) temperature A, and IN (indoor) temperature B. Press Alert/Set Button again to quit n setting. It will alarm when indoor temperature is higher than A, outdoor temperature lower than B. Press this button for less than one second.to close or open alert function.
Max/Min Button: Press this button to display recorded Max & Min temperature values. Alternate display turn: Max. / Min. / Current value. 
Reset Button: Press this button to clear all recored Max. / Min. / Alert values.
Power supply: one 1.5V AAA battery
Product size: 110x70x20mm
Product weight: about 80g
Standard accessories: meter (with battery), manual

Packing: single blister
Packing quantity: 100PCS/CTN
Carton size: 57.5x30x24.5CM
G.W./N.W.: 11.5/10.5KG