Description: Support most high-impedance 16-300Ω headphones, 3.5mm AUX input and output, signal-to-noise ratio100Db, THD+N=0.0003%, fully filter out noise, and enjoy high-quality audio This headphone amplifier enhances the signal input to the amplifier circuit to achieve the best performance of the headphone, not only output louder sound, but also output clearer and more realistic stereo without distortion Adopts 600mAH rechargeable lithium battery, keep the headphone amplifier working for more than 8 hours. In addition, there is a volume control knob to adjust the volume Compatible with various digital devices, such as MP3, MP4, Phone, Pad, computers, CD players and personal media players, for one, for PS4 controllers, etc. . Portable and Lightweight, designed to let you enjoy music Specification: Type: Headphone Amplifier Size:Approx.9.5 x 6.2 x 1.5cm/3.7 x 2.4 x 0.6 inch Headphone amplifier Audio Input: 3.5 mm, Audio output: 3.5 mm Battery capacity: 600mAH Working voltage: DC3.7-4.2V Charging voltage: DC5V Package Includes: 1x Headphone Amplifier 1x Audio cable 1x USB Cable Note: 1.Please allow 13 cm error due to manual measurement, thanks. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, thank you.