Features: Using MC33202 operational amplifier, the sound quality is clear, without distortions or noise. Three output port can achieve independent or mixed output, directly driving headphones support real-time monitoring. 3.5mm port, suitable for capacitive or inductive microphones. Build in 150mAh battery, and can be used continuously for about 10 hours after one charge. 0-20dB adjustable gained control, power by DC5-12V, precise control of microphone output level. Specifications: Material: Metal + Plastic Color: black Size: approx. 5.5x4x2cm/2.16x1.57x0.78inch Model Name: ME1 Electret Microphone Amplifier Output: 3.5mm port Battery capacity: 150mAh Technical parameters: Supports multiple channel input Adjust the gained control from 0 to 20 decibels DC5-12V power supply Usage scenario: Suitable for band rehearsals, live performances, and recording studio use, compatibility with multiple instrument pickup devices, providing precise tuning function Package Includes: 1 Piece Electret Microphone Amplifier note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.