1. It can detect metal items, is easy to operate, and supports one click operation for testing. 2. Simple and easy to use, compact in size, and easy to carry. 3. Equipped with a buzzer alarm sound, the buzzer sound an alarm when the detector detects metal. 4. With indicator lights, the LED red light flashes to alarm. When metal objects are detected, the red indicator light flashes to indicate the alarm mode. 5. Widely used, it can detect games and entertainment, conduct safety checks, and search for metal products on the body. Working current: around 23mA (under normal alarm conditions) Static working current: 3.7mA (without alarm) Power voltage: Two button batteries Working power supply: 3-5 V PCB size: 60 x 185mm Maximum detection range: 3-5 cm, the larger the metal area, the farther the detection distance, and the smaller the metal area, the closer the detection distance Kit usage: gaming and entertainment, safety checks, searching for metal products on the body, etc. 1. When the detector approaches the metal, it sound an alarm 2. Double alarm of buzzer and LED light 3. Adjust the potentiometer to modify the alarm threshold 4. The LED red light flashes to alarm. When a metal object is detected, the red indicator light flashes to indicate the alarm mode. The measured object must be 2.5cm. Note: 1. For the shipment of physical loose parts, it is necessary to provide welding tools and customers need to weld and assemble them themselves. 2. Component batch issue, color , it does not affect use, please be cautious when . It's DIY kits, needs to finish by yourself. Color: Black Material: PCB+Components Package Contents: 1 * Metal Detector Electronic DIY Kit (Delivered in parts; including 2 button batteries) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.