Gearwell B4 X - Vacuum Tube Rechargeable 2.5mm 3.5mm

Item Type: Headphone Amplifier Model: B4 X Material: Aluminium Alloy Output: 2.5mm balanced output through BAL interface, and 3.5mm standard stereo interface output. 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 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 , 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.