1、Multi Headphones Support: Support most high impedance 16‑300Ω headphones, 3.5mm AUX input and output, signal to noise ratio>100Db, THD+N=0.0003%, fully filter out noise, and enjoy high quality music. 2、2 Stage Gain Switch: This headphone amplifier enhances the signal input to the amplifier circuit to achieve the best performance of the headphone. It can not only output louder sound, but also output clearer and more lifelike stereo without distortion. 3、Rechargeable Lithium Battery: Adopt 600mAH rechargeable lithium battery, which can keep the headphone amplifier working for more than 8 hours. In addition, there is a volume control knob to adjust the volume. 4、Portable and Lightweight: This headphone amplifier is designed to let you enjoy music anytime, anywhere, compact size for portable design; the sturdy shell and chassis can achieve long lasting use. 5、Wide Compatibility: This amplifier is very compatible with various digital devices, such for MP3, for MP4, for tablet, for music player, for smartphone, for computers, for CD players and for media players, for Xbox one, for PS4, for PS5 controllers etc. 6、Good Sound Quality: Restore the real sound quality with a wide dynamic range, reduce the distortion rate to create a wide and deep sound field, and the sound quality is delicate and accurate.