USB DAC Headphone Amplifier
LVY USB amplifier is a highly flexible audio interface, which can be used with either mobile phone, laptop or desktop system.
Plug-and-play for instant audio playing and compliant with all mainstream operation systems.
Two-stage gain switch: L/H,enhances the signal input into the amp circuit for optimal performance of the headphones.
Noise Reduction Function, and Distortion with Enhanced Dynamics, Perfect Pure Stereo Effect, HD Voice Music Sound Quality Optimization
Not only suit for music enthusiast, also could be a ideal gift for those who has trouble hearing.
NOTE: When Type-C and 3.5mm are plugged in at the same time, Type-C audio will be output firstly, unplug USB type-c to switch to 3.5mm and 4.4mm audio output.

Feature
Input : USB Type C and 3.5mm AUX Input
Output: 4.4mm jack and 3.5mm jack AUX Output
Charged by Micro USB Cable
Under charging state：Blinking blue
When the battery is full：Blue light keep on
General charging time is: 1 hour 40 minutes
Battery capacity: 2600 mAh.

Q: All cables are connected, but there is no audio output?
A:1. Please check the power indicator is on, if not, turn the potentiometer on.
2. If the power indicator light up, check that the VOL knob is in the smallest state, if it is, and it is normal to rotate clockwise in the minimum state.
3. If both of the above are normal, check whether the audio source playback device is paused, muted, or the volume is minimal.

Q: Why the headphone has a big buzzing sound when the input line is connected but not play?
A: When an unshielded signal line is empty, an interference signal will enter the amplifier and be amplified. If you dislike the sound, we suggest you replace the shielded signal line or unplug the signal line.

Note:
If the headphone impedance is more than 100 ohms, GAIN is set to the H position; if the headph