Fully functional, very clean, wired, plugs into a standard grounded outlet. Includes 2 interconnected Vaisala HMT337 Dewpoint & Humidity/Temperature transmitters. Each transmitter has its own Vaisala Power-1 internal power supply (120VAC to 24VDC) and one of them has digital display. Includes 2 temperature/humidity probes and the user's guide (209 pages pdf). High quality, made in Finland. Pre-owned and tested industrial surplus from a closing plant in Quebec, Canada. Minor surface scratches only.