This is a two-way version of the traditional X10 appliance module (2 pin) that has some new features that users have been asking about for years. With the new two-way feature, computer interfaces that can generate ''Status Request'', will receive an X10 signal back from the appliance module indicating it's status, ON or OFF. The new two-way module is much more sensitive to the X10 signal. It was able to receive and react to X10 signals at 50 mV, whereas normal X10 modules need 100 mV of signal strength.