AKG K175 Recording Monitoring Studio Headphones+Rechargeable Headphone Amp

• (1) AKG K175 On-Ear Closed-Back Foldable Recording Monitoring Studio Headphones
• (1) Rockville HeadRock Battery Powered Rechargeable Personal Headphone Amplifier Amp

Features of K175:

• On-ear, foldable, Closed-Back design
• Largest in-class 40mm drivers, 32 Ohms
• Frequency range 18 Hz – 26 kHz, 114 dB SPL
• Detachable coiled cable with replaceable ear pads
• Slow-retention foam ear pads for comfort and isolation

Video of HeadRock:

• 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@16O 89mW@32O 95mW@64O 69mW@120O 29mW@300O
• 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)

Owner's Manual?