Features 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 Detector Product Material: Plastic Specifications: 1 Set Product Use: Household Scope Of Application: Most Scenarios Battery Type: 9V Alkaline Battery x 2 (Shipped With Matching Battery) Battery Model: 6F22 Battery Capacity: 60mah Product Size: Approx.6 x 19.5cm / 2.4 x 7.7in Package List 1 x Inspection Needle 2 x Battery 1 x Test Card