1、HIGH SENSITIVITY: Headphone amplifier has high sensitivity, ALC automatic level control, 1000 times amplification, so you can hear the faint sound. 2、CLEAR SOUND: Portable headphone amp amplifies your voice with clear, crisp, noiseless, distortion free sound, stylish and powerful. 3、INTERFACE IS 3.5MM: Stereo headphone amplifier direct drive headphones to listen, can be connected to cell phone recording, the interface is 3.5mm. 4、ALUMINUM ALLOY HOUSING: Microphone amplifier with aluminum housing, compact size, storage and carry are very convenient, beautiful appearance. 5、ANTI INTERFERENCE: Headphone amplifier ensures lossless signal as well as strong anti interference performance, very reliable. 6、APPLICABLE RANGE: Headphone amplifier is suitable for teaching, trainers, singers, coaches, shopping malls, presentations, outdoor speeches, etc.