XVive P2 In-Line Tube Preamp for Dynamic Microphones, in-line preamp / booster for dynamic or ribbon microphones, Nutube 6P1 vacuum tube technology for authentic analog warmth with the ?exibility to dial in tube tones or clean boost, provides up to +40 dB of gain boost, robust signal boost maintains signal integrity over long cable runs, reducing noise and signal loss, improved signal-to-noise ratio for cleaner recordings, USB rechargeable lithium battery (1900 mA) for up to 10 hours of continuous operation, 2 to 2.5 hours charging time at 800 mA charging current, no phantom power required - ideal for mixers, audio interfaces or other gear with a microphone input, built-in protection circuit against accidental phantom power, does not supply phantom power to connected microphones, controls for Gain and Volume, female XLR input and male XLR output (both balanced), dimensions (L x W x H) 45 x 114 x 41 mm / 1.77" x 4.48" x 1.61", weight 275 g / 9.7 oz, incl. USB charging cable