HGDO Universal Portable Headphone Amplifier – Black

Input via the 3.5mm jack, enhance phone output power and improve phone sound quality and tone color to provide a better listening experience.
SUPER PORTABLE：Light at only 25 grams,Highly compact mini design and the fine aluminum alloy process makes it more small and exquisite than lighters.
LONGEST BATTERY LIFE : The new and improved lithium polymer battery allows high fidelity continuous playback for up to 22 hours.
EASY ASY TO USE : Automatic detection of headphones into the boot, Pull out the headset automatically shut down, No key operation required.
BUILT-IN BATTERY : Via from PC/MAC or external USB power adapter, Micro-USB port for battery charging.
item value note
output power Maximum: 300 mw * 2 / 16Ω FIN = 1 KHZ;
Rout = 32Ω;
Pout = 130 mw
Vcc = 4.2 V
frequency response 2-27 KHz
SNR 95DB
90DB dynamic range
degree of separation
distortion ≤0. 006%
32Ω impedance input
output impedance ≤ 200Ω
operating temperature-40 & deg; C at 60 & deg; W
storage temperature-40 & deg; C at 85 & deg; W
Storage humidity 10% to 90%
the value of the Power Supply Notes
lithium battery 200 mah * (different models are different configuration) for 20 hours
protect the circuit
battery protection, overcurrent protection, overvoltage protection, short circuit protection