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Product specifications and system requirements
Specification	PRO1 R250W Wireless Outdoor Sensor
Brand	PRO1
Model	R250W
SKU	107353
Component role	Sensor
Lifecycle	Current
Building systems	PRO1 PROsync Wireless
Requires	PRO1 T755WHO PROsync Wireless Thermostat System
Dimensions	3.875 W × 3.875 H × 1.125 D in
Measured variables	Temperature
Operating humidity	90% RH maximum, non-condensing
Operating temperature	-40 to 140 °F (-40 to 60 °C)
Power sources	2 AA batteries; lithium primary AA recommended for cold climates
Required accessories	T755WHO PROsync wireless system and equipment module, sold separately
Sensor output types	PROsync proprietary wireless