Ujjdwiurgh 300Ω HiFi Headphone Amplifier Rechargeable Portable Amp 3.5mm AUX Input Output for MP4 Mobile Phone Earphones

3. Two-stage gain switch enhances the signal input into the amp circuit for optimal performance of the headphones 4. Aluminum matte , fashion design provides you a comfortable handheld feeling while the aluminum matte makes it . 1. 16-300Ω Mini HiFi headphone amplifier, It is delicate, compact, , and portable that it can be carry conveniently. 2. 3.5mm AUX input and output, SNR 100Db and +N 0.0003%, possibility to output not just louder sound, but a and more real stereo sound without distortion. 5. Rechargeable lithium battery, it adopts a rechargeable lithium battery with 1000mAH capacity, which allows it to stay working more than 8 hours.