Description 1. Using high-quality materials with guaranteed quality 2. This product is widely used in precision measurement instruments, building automation, precision mechanical equipment, elevators, lifting equipment, automation systems, calculator office equipment, servo system inverter equipment, frequency conversion equipment, lighting, information communication equipment, UPS switching power supply, automotive electronics and other equipment 3. It is a reactive low-pass filter 4. Obvious filtering effect 5. Stable performance Colour:As Shown Material:Metal + Plastic Package Contents: 1 * Audio power filter board 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.