Fangrui Product Details Description/enhance Your Audio Experience With Our Hifi Headphone Amplifier, Designed To Drive Headphones Ranging From 16-150 Ohm. This Compact Yet Powerful Device Offers Adjustable Amplification To Suit Your Listening Needs. Universal Compatibility: Comes With A 3.5mm Jack Cable, Making It For A Wide Range Of Mobile Phones And Music Players. Portable Design: Its Lightweight And Portable Design Makes It Easy To Carry, Ensuring You Can Enjoy High-quality Audio Wherever You Go. Easy To Use: Simply Plug In And Play With No Complex Setups Or Installations Required. Input/output Port: 3.5mm Audio Port Distortion: 0. Snr: 2120db Load Impedance: 16-150 Max. Power Output: 250mw In Impedance 16 Amp Internal Voltage: +4v Charging Voltage: Dc 5v Frequency Response: 20hz-20khz(+3db) Lithium-battery Capacity: 1000mah Amp Using Time: About 6 Hours Due To Different Batches, There May Be Differences In Product Appearance And Printed Text, Which Will Not Affect Use Colour:black Material:abs Package Conte