Square D WISEREM is a home energy monitoring device that measures the currents and voltage in the service mains. It monitors two phases of 120 Vac and is compatible with 120 Vac (90-130 V) power sources. The device uses less than 5 Watts of power and has a Wi-Fi connection that operates on a 2.4 GHz 802.11 b/g/n network. The Wiser Energy monitor can be used with Square D DTM circuit breakers, load centers, and combination service entrance devices (CSEDs). It can also be used with non-Square D load centers and CSEDs, but the manufacturer should be consulted for compatibility.