Specification: 1800ma lithium cell bb tpa6120a2 for headphone amplifier bb opa2134 for pre-amplifier alps 100k2 as potentiometer for volume controll high and low gain maximum output: 120mwith32Ω/12mwith300Ω frequency response: 20hz~20khz(-0.5db) input sensitivity: 520mv/47kΩ(low gain)/260mv/47kΩ(high gain) harmonic distortion: <0.007% snr: >98db output power: 120mw @ 32 ohms, 12mw @ 300 ohms power supply (adapter): Dc5v / 1a USB port cargo battery charging time: 1a adapter, full time about 6 hours (turned off) USB port, full time about 10 hours (turned off) battery playing time: More than 13 hours power supply: Built-in rechargeable lithium polymer battery, the capacity 1800mah recommended headphone impedance: 16-300 ohms dimension: 6 x 7.3 x 1.6 cm net weight: Approx. 100g package 1 x h1 unit 1 x USB cable 1 x user manual 1 x warranty card.
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