Specialized Cycle Computer?
I could not find the SpeedZone Sport Double Wireless ANT+ manual on line but I did find the SpeedZone Sport Manual on line and here are the spec's



I would expect the SpeedZone Sport Double Wireless ANT+ model to be similar.  A agree with the comments that say a bit below should work fine but too much below and you will likely lose the Liquid Crystal Display until the unit warms back up to within the specified operating range