Headphone Amplifier Portable Headphone amp 3_5mm Stereo Audio Out? Powered Dual-Output with Lithium Battery and 2-Level Boost Bluetooth Headphone Amplifier

HiFi headphone amplifier overview "Your Perfect Audio Companion --- Proster 3.5mm Portable Headphone Amplifier Rechargeble HiFi Amp for iPhone iPod MP3 MP4 Player Computer HiFi Headphone Amplifier -- supports most headphones of high impedance 16-150?, signal-to-noise ratio> 100Db, THD + N = 0.0003%, fully filter noise, enjoy high-quality audio. " Personality Stereo -- High quality headphones audio cable with gold plated interface, improve your 3.5mm headphone output sound quality tone and create a more realistic stereo output. 1000mA rechargeable lithium battery for continuous 8-15 hours usage; 1m USB charging cable provided; Charging Indicator for power checking; Volume Control knob, adjust headphone output as your will. "Aluminum alloy shell -- Shield and Reduce Signal Interference, enhance heat resistance; Durable sleek aluminum matte surface provides a comfortable handheld feel. Compact and portable, universal compatible with various digital devices, MP3/MP4/Mobile phone/PC/IPods/laptops/Notebooks/CD players/Personal Media Players " 3.5mm AUX Input and Output.High Quality Audio, Suitable for your Mobile Phone MP3 MP4 Laptop PC Specification Capacity: 1000mAH?3.7V). Amp Using Time: More Than 8-15 Hours. Working Voltage: 8.3V/1A. SNR>120dB. Distortion: 0.004%. Output Power: 40Mw in Impedance 16?. Headphone Impedance: 16-300?. Audio cable: 1m and 0.12m 2pcs Audio cable, both male to male. Dimension:103mm*53mm*12mm(L x W x H). Package Contents 1 x Bluetooth 5.0 HiFi headphone amplifier. 1 x 3.5mm Audio Cable 1M. 1 x 3.5mm Audio Cable 0.12M. 1 x USB Charging Cable. 1 x User Manual. Note If the headphone impedance is more than 100 ohms, GAIN is set to the H position; if the headphone impedance is less than 100 ohms, the GAIN is set to the L position.