This product is a induction tool. It is made of a flame-retardant ABS shell and a copper coil with good conductivity. It is safe and durable, with excellent texture, which can meet your needs well. It is a very good . The induction tool will serve you very well. Features -Color: Blue. -Material: ABS, Copper Coil. -Size: About 9.60X8.80X2.70cm/3.77X3.46X1.06inch. -Inner diameter: 50/5. -Perforation: 38MM cable. -Rated voltage: 0.66KV. -Frequency range: 20HZ-400HZ. -Working temperature: -40 degree centigrade-+85 degree centigrade. -The design is reasonable, and practical, with stable performance, and can be used for signal sensing. -It is made with excellent craftsmanship, safe and practical, not easy to damage, it will be your of induction tools. -The ABS flame-retardant case makes your use safer and can meet your needs well. -It is made of copper wire material with good conductivity to provide you with more signal sensing. -This is a very good sensing tool, which will meet your needs very well. Package list: 1 x Sensor