Rockville HeadRock Battery Powered 16 ohm 300 ohm Headphone Amplifier Amp

Includes: (1) x headphone amp. (1) x Micro USB cable. (1) 3.5mm male to male audio jack cable. Manual and warranty card. Features: Rockville HeadRock Battery Powered Rechargeable Personal Headphone Amplifier. 3.5MM headphone output. 3.5MM aux input for music player. Lithium Battery with 800mAh capacity Rechargable battery lasts 5-8 hours per charge. Headphone Amplifier Works with 16 300 Ohm Impedance. Headphone output power: 65mW@16? 89mW@32? 95mW@64? 69mW@120? 29mW@300?. High/Low gain switch Volume control. 300mv - 2000mv. Strong aluminum case ensures long life and strong heat dissipation. Chipset: NE5532. THD: 0.0001%. Signal to Noise Ratio: 125dB. Frequency Response: odB (20Hz-20kHz) AMP Internal Voltage: 8V / 500mA. DC power Charging: 5V 1A. Weight: 0.17 lbs. Dimension (inches): 3.74 x 2.09 x 0.5 ( L X W X H)