DAE DEM720-1 Electric kWh Submeter, Internal CT, 1P2W (1 hot wire, 1 Neutral), 120v, 50A Current sensor (CT) is built inside of the DEM720-1 kWh meter. Single Phase, 2-wire (1 hot wire, 1 neutral), 50A, 120V, 60Hz DEM720-1 sub-meter provides a great value if you are looking for a simple, reliable and easy-to-install 120v kWh meter. DEM720-2 energy meter is for 240v configuration. For more sophisticated electric meters, please refer to DAE Polaris series listed in Amazon. Most of our customers will be able to receive their items in 3 business days (Continental US). If you order by 4:30pm Eastern Time Monday through Friday and by 1pm Saturday, we shall deliver in the same day. Indoor use only, DAE watertight NEMA 4 enclosure (ASIN: B01GZF045Y) is available for outdoor use.