La Crosse Technology WS-9121 - Manual (Page 39)

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Outdoor : -39.9ºC to +59.9ºC with 0.1ºC resolution
(-9.9 to +59.9 °C with 0.1°C resolution)
(“OF.L” displayed if outside this range)
Indoor Temperature checking interval : every 15 seconds
Outdoor data checking interval : every 16 seconds
Power Supply
Temperature Station
: 2 x AAA, IEC LR3, 1.5V
Outdoor Temperature Transmitter : 1 x IEC CR2032, 3.0V
Battery life cycle : approximately 12 months (Alkaline
batteries recommended)