Simple operation, exquisite design, easy storage, low failure rate. . Sensitivity is very easy to detect a pin-sized (or even smaller) metal object. The sensitivity can be adjusted according to site requirements. . There is battery undervoltage indication (LED light is always on). .It is commendable that this style is quite good among similar style products. .There are two types of alarm prompts: sound and light, and vibration., Manufacturer: CFWWSAQ