[Material]: FBX2.1 feedback suppressor is made of Metal material, which is strong and wear , ensuring long term performance and reliability [Easy to Use]: Professional feedback suppressor, with high reliability and performance, is easy to use and adopts plug and play design, without complicated settings, so that you can easily and quickly install it into the audio system [Function]: Audio processor, professional manufacturing, stable performance, helps you howling and distortion, creates a comfortable and pleasant listening environment and extends the service life of audio equipment [Wide Application]: Feedback suppressor is suitable for various occasions. You can use it in meetings, homes, parties, , concert and other scenes [Anti Howling Function]: Anti howling suppressor can improve the sound quality of audio by suppressing the distortion caused by the feedback loop, providing you with clear and accurate sound Power Supply Method: External Power Supply (c Charging Head and Charging Cable) Input V: 5 V-12 V Power Supply: 220 V Passage: 2 in 1 out Colour:Black Material:Metal Package Contents: 1 x FBX2.1 Feedback Suppressor 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.