Item Type: Headphone AmplifierMaterial: Aluminum AlloyColour: BlackBattery Model: Lithium Battery (Built In)Battery Capacity: 1000mAhInput/Output Port: 3.5mm PortAmp Use Time: About 6 HoursLoad Resistance: 16-600 (Can Push the Resistance Range of Earphones)Distortion: 0.002%Signal to Noise Ratio: 120dBPower Output: 250mW inAmplifier Internal Voltage: 4VCharging Voltage: DC 5VFrequency Response: 20Hz-20kHz (3dB)Parameters: Compatible with a variety of digital devices with 3.5mm AUX output such as MP3, MP4, mobile phones, for PS4 controllers, etc. Type C input is compatible with mobile phones, computers, and laptops.The enhanced signal is input into the headphone amplifier circuit to make the headphones play the best performance. With bass switch, provide a more delicate and round bass performance, giving you a more shocking music experience.Package List1 x Headphone Amplifier1 x 3.5mm Cable1 x USB Power Supply Line1 x ManualManual measurement has 1& 8209;2cm error.13.5mm AUX and Type C Versatility: 3.5mm AUX and the USB Type C ensures a more reliable and stable connection. SNR>120Db and THD+N 0.002% make it possible to output a sharper and more real stereo sound without distortion. 2Wide Application: This headphone amp is remarkably compatible with a various of digital devices with 3.5mm AUX output such as MP3, MP4, phones, for PS4 controllers, and Type C input is compatible mobile phone, computer, laptops. 316600 HiFi Headphone Amp: Support 16600 impedance, headphone help headphones with high impedance or low sensitivity to be better driven, It is delicate, compact, lightweight, that can be carried conveniently. 42 Stage Gain Switch and Bass Boost: It enhances the signal input Into the amp circuit for optimal performance of the headphones.With bass switch, providing more delicate and mellow bass performance, giving you a more shocking music experience. 5Volume Control and Durable Shell: There is knob allowing you to adjust the volume, which is also an on/off switch. Aluminum alloy casing, durable overall Shielding reduces signal interference and enhances heat resistance.