This super high gain mini microphone and preamp are the smallest and best in the world. The preamp features low noise, extremely high gain and auto level adjustment by on-board IC. The mike is super tiny-- and the preamp is built right in. Weight is under 1/2 ounce for preamp and mike. Output is line level and voltage requirement is 6-15 volts DC. Fully configured system with six foot mike lead and plug and play cable terminations with RCA connector.