Portable Headphone Amplifier 2 Stage Gain Switch Superior Sound Quality 16 To 300 Ohm 3.5mm AUX Input Output Earphone Amp1Wide Compatibility: This headphone amplifier supports a wide range of high impedance 16300 headphones. With 3.5mm AUX input and output, it ensures clear quality audio and eliminates noise, allowing you to enjoy premium sound. 22 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. 3Rechargeable 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. 4Portable 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. 5Wide 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.