Description: 【Material】Headphone amplifier is made of metal material, which is durable and wear resistant, can be used for a long time. 【Function】After amplification, the words and music can be output independently or mixed for output. There are three output ports in total. The mixed output port can directly drive headphones for listening. 【Usage】The 3.5mm interface has a bias voltage and can be used with electrets and common condenser microphones. The 6.5mm interface is a dynamic microphone that can amplify wired and wireless microphones. 【Feature】The dynamic microphone 6.5 interface amplifies 75 times (37.5db), the 3.5 interface condenser microphone amplifies 22 times (26.8db), and the stereo music input 3.5 interface amplifies 5 times (14db). 【Application】Headphone amplifier great for listening to music or watching TV if you have two or sound setups on your computer or listening with a stereo amplifier Specification: Material: Metal Size Chart: 10.7cmx4.9cmx2.6cm/4.21inchx1.93inchx1.02inch Package Includes: 1 Piece Condenser Microphone Amplifier Note: Please allow slightly errors due to manual measurement and different monitors.