Feature:1. Multifunction: With high sensitivity, one key adjustment function, sound and light alarm function at the same time, long term continuous work without heat and overload.2. High Performance: Using high end imported digital chip, the performance is more stable and durable, simple operation, light weight, easy to carry, high sensitivity detector.3. Applicability: Suitable for thin parts, ideal for testing small items, accurately finding small ferromagnetic metal needles or the exact location.4. Magnetic Induction Principle: The handheld portable needle detector uses the magnetic induction principle to effectively and accurately detect the specific iron position of the needle and other items.5. Note: Supply voltages lower than 6v will produce more than continuous chirps, indicating a lack of power and must be replaced.Specification:Item Type: Handheld Needle DetectorProduct Material: PlasticSpecifications: 1 SetProduct Use: HouseholdScope Of Application: Most ScenariosBattery Type: 9V Alkaline Battery x 2 (Shipped With Matching Battery)Battery Model: 6F22Battery Capacity: 60mahProduct Size: Approx.6 x 19.5cm / 2.4 x 7.7in.Package List:1 x Inspection Needle2 x Battery1 x Test Card