National Geographic 315NC it is recommended to use Lithium, batteries during the cold months

Specifications

Temperature Measuring Range

Monitor	0°C to 50°C (32°F to 122°F)
Outdoor Sensor	-35°C to 70°C (-31°F to 158°F)
Temperature Checking Interval
Monitor	35 seconds
Outdoor Sensor	35 seconds
Power Source
Monitor	2 x AAA batteries, 1.5V
Outdoor Sensor	2 x AAA batteries, 1.5V
	(it is recommended to use Lithium
	batteries during the cold months)

Industry Canada/FCC Statement

Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device.

WARNING: Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.

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