Feature:1. HIGH GAIN: Mic preamplifier enhances your sound experience with balanced amplification circuitry with 20db gain, providing clean, transparent gain.2. 48V PHANTOM POWER: Mic preamp is compatible with a range of microphones, including for SM7B, for 55SH and other popular models. Comes with 48V phantom power for use with both dynamic and condenser microphones.3. LOW NOISE: Microphone preamp features a unique, fully balanced circuit design that produces ultra low noise and clean sound, ensuring minimal noise and adding no sonic coloration to your recordings.4. BLACK METAL CASE: Dynamic condenser microphone booster's black metal casing is not only rugged, but also low noise by effectively eliminating most EMC interference.5. COMPACT AND LIGHTWEIGHT: Microphone preamplifier is compact and lightweight, making it easy to carry and store. Perfect for home studios and professional studios, recording, podcasting and live streaming.Specification:Item Type: Microphone PreampMaterial: Aluminum AlloyColor: BlackBattery: Polymer Lithium Ion Battery (Built In) Capacity: 800 MAhInput And Output Interface: 3.5mm, 6.35mm, XLR 3 kinds of interfacesCircuit: Balanced Amplification CircuitGain: 20dbSupport: 5V, 48V Condenser Microphone, Dynamic MicrophoneWorking Time: Dynamic Microphone Can Be Used Continuously For More Than 10 Hours, Condenser Microphone Can Be Used For About 3-5 Hours When 48V Is Turned On (Different Microphones Perform Differently, Please Do Not Turn On The 48V Switch When Using Dynamic Microphone).Package List:1 x Microphone Preamp1 x Sound Cable1 x USB Power Cable