Headphone Amplifier Two-Stage Gain Switch, Portable Headphone Amp for MobilePhone and PC 3.5mm Stereo Audio Input Out Space Grey

?【Headphone amp 3.5mm AUX Input and Output】Support SNR>120Db and 16-300Ω Make it Possibility to output not only louder sound but a sharper and more Real stereo sound without distortion., ?【Two-stage Gain Switch】It enhances the signal input into the amp circuit for the optimal performance of the headphones., ?【Aluminum Matte Surface】Fashion Design Provides You a Comfortable Handheld Feeling While the Aluminum Matte Surface Makes it Durable, ?【USB Rechargeable】Headphone amplifier built-in 1050mAH rechargeable lithium battery, Which Allows it to Stay Working More than 8 Hours, ?【Broad Compatibility】such as MP3, MP4, Mobile Phone etc.. you use phone to headphone amp, lightning to 3.5mm cable is not included, you need to buy it yourself.