Minimal wear, minimal use if any at all. 

Comes with Wireless Talking Display (7.25" L x 5.3" W x 8.375" H) 3 "C" Alkaline Batteries (not included) 

Secure Weather Gateway (6.6" L x 1" W x 1.6" H): Powered by Included AC Adapter, LAN Cable Included to Connect to Network Router

Wireless Temperature Sensor (1.5" L x .8" W x 5" H): Outdoor Temperature Range: -39.8°F to 139.8°F (-39.8˚C to 58.9˚C) 

Mounting Hardware Included, 2 "AA" Alkaline Batteries (not included)

There is no manual however it can easily be found online.