FEATURES : Dual 10 pairs of sensor and designed for universal AC power supply. LED control panel with 10 segments led monitor identifies the exact location of foreign object so that you can find it easily. Smart counter can counts the detected products automatically. Monitor of detecting sensitivity helps to adjust sensitivity. The conveyor belt is made from non poisonous material. When sensor detects a broken needle or over a 1.0 mm iron ball, buzzer will sound and conveyor belt will stop. After that, detected products will be return at hand.