Portable Headphone Amplifier with Built-in Lithium Battery, 3.5mm Audio Output Amp for Phones, MP3, MP4, Tablets & Computers

This pocket-sized portable headphone amplifier is equipped with an internal rechargeable lithium battery, breaking the limitation of wired power supply to support outdoor, travel and on-the-go audio boosting. It adopts standard 3.5 mm audio jacks for both signal input and headphone output, perfectly matching smartphones, MP3, MP4, tablet computers, laptops and desktop PCs. The built-in audio amplification circuit effectively lifts output power, delivering richer sound details, stronger bass and higher volume for headphones that sound weak directly connected to mobile devices. The slim lightweight housing takes up little space in backpacks and pockets.

It supports long playtime after a single full charge, ideal for music lovers who use high-impedance headphones with portable players. Simple plug-and-play operation without complicated driver installation, just connect your audio source and headphones to start enjoying enhanced audio performance.
Note: Charge the built-in lithium battery via USB cable before first use; adjust volume gradually to avoid sudden loud sound damaging your hearing and earphones.