YDuupxe B4 X

Specification: Item Type: Headphone Amplifier Model: B4 X Material: Aluminium Alloy Input: 3.5mm Stereo Input Output: 2.5mm balanced output through BAL interface, and 3.5mm standard stereo interface output. Charging Voltage: 12.6V Battery: 1 x 1000mAh 12V lithium battery, shipped with built in battery. Charging Time: 2-2.5 hours full battery. Working Time: 4-4.5 Hours Output Power: 450mW Signal to Noise Ratio: 99dB Recommended Load Impedance: 16-400Q Package List: 1 x Headphone Amplifier 1 x Power Adapter 1 x Audio Cable 2 x Band 1 x User Manual Note: When using the headphone amplifier on your phone, if you hear some noise in your headphones, this could be the interference from the cell phone, such as WIFI or 4G signal, that interferes with the tube and makes the noise. This is normal. Because all tubes have a microphone effect. To avoid this, keep your phone away from the headphone amplifier.