Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Unreliable

Claims to have AC detection. In use the AC live wire detection warning is constantly beeping. While the AC alarm is active, the unit doesn't find any studs. The instructions claim that the sensor may be influenced by live wires up to 18" away. The suggested method for dulling the sensitivity is to either place your other hand on the wall near the sensor or hold the unit 1/2 " off the wall. When you do this, the AC detection doesn't fire and it classifies studs as studs and live wires as studs. Essentially the live wire detection is useless and only serves to confuse the sensor. In the end I resorted to traditional methods of finding the studs. This contraption will be heading back for a refund.