1.Two parts: right and left detecting board + mainframe ergonomically designed, tamper-proof and anti-blind spots designed. 2. Independent detection and led display on the right, center and left zone, the max sensitivity is one-coin sized. If the target metal detected on the left zone, the left led will light, if on the right zone, the right led light, and if center, the left and right led both light. 3.Automatic recording number .