<p>1\u3001Wide Compatibility: This headphone amplifier supports a wide range of high impedance 16\u2011300\u03A9 headphones. With 3.5mm AUX input and output, it ensures clear quality audio and eliminates noise, allowing you to enjoy premium sound. 2\u30012 Stage Gain Switch: This headphone amp enhances the signal from the input to the amplifier circuit, enabling optimal performance of the headphones. It not only outputs louder sound but also delivers clearer and more stereo sound without distortion. 3\u3001Rechargeable Lithium Battery: Equipped with a 1500mAH rechargeable lithium battery, this headphone amplifier can work for over 8 hours. Additionally, it features a volume control knob for convenient adjustment of the volume. 4\u3001Portable and Lightweight: Designed to be portable and lightweight, this headphone amplifier allows you to enjoy music anytime, anywhere. Its sturdy aluminum alloy casing ensures durability for long term use. 5\u3001Wide Compatibility: This amplifier is compatible with various digital devices such as MP3, MP4, Phone, computers, CD players, personal media players, and more, making it versatile for different audio setups.</p>