【HiFi Sound Quality】: This Headphone Amplifier is made of pp material and provides HiFi level sound quality, allowing you to enjoy a purer and more detailed music experience. 【Powerful Amplification】: Portable Headphone Amplifier can effectively enhance the driving force of headphones, making the music more dynamic and detailed, providing you with an immersive listening experience. 【Portable Design】: With its compact size and lightweight design, Headphone Volume Amplifier allows you to enjoy anytime, whether at home, in the office or on the go. 【Two Level Gain Switch】: The 3.5mm Headset Amplifier is equipped with a bass volume control function, you can adjust the bass effect of the music according to your personal preferences, while achieving the best performance of the headphones, outputting larger, clearer and more realistic sound. 【Wide Compatibility】: HiFi Earphone Amp is compatible with headphones with 3.5mm interface; it can also be used with various devices such as mobile phones and computers, which is very convenient. Size Chart: 9.4cmx6.1cmx1.6cm/3.70inchx2.40inchx0.63inch Package Includes: 1 Headphone Amplifier Note: Please allow slightly errors due to manual measurement and different monitors.