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 Preamp Material: Aluminum Alloy Color: Black Battery: Polymer Lithium Ion Battery (Built In) Capacity: 800 MAh Input And Output Interface: 3.5mm, 6.35mm, XLR 3 kinds of interfaces Circuit: Balanced Amplification Circuit Gain: 20db Support: 5V, 48V Condenser Microphone, Dynamic Microphone Working 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 Preamp 1 x Sound Cable 1 x USB Power Cable