Features: brand new and high quality Ultra-thin 34mm pure gold-coated condenser microphone capsule It has a flat and smooth frequency response curve, with a very crisp and detailed response to high frequencies, and a very firm, warm . Whether recording vocals, traditional acoustic instruments, or general micing a drum kit, the U81 is very well applicable The sound is bright and transparent, and the high-end is full of air. The cover effect recorded with it in the audio application is very good. At the frequency of 10Hz~55Hz, the three-axis full-amplitude vibration is 2mm per minute. After 2 hours, the sensitivity change is within 3dB. Package Includes: 1 PC x Cartridge Core Capsule for Microphone Specifications: Performance parameters Model: U81 Material: Copper Sensitivity -35(3)dB (at 1KHz 0dB=1V/Pa) Pointing characteristics Cardioid (at 1KHz) Frequency response 20Hz-20KHz Maximum sound pressure level 140dB (at 1KHz1% for T.H.D) unit size 34mmX9.2mm Typical frequency response curve Ambient temperature: 20 2 Reference sound pressure level: 1Pa ( 94 dB SPL at 1 KHz ) Installation size: F348.8(mm) Lead length: 50mm Storage temperature: -10-+55 Operating temperature: +5-+55 After being placed for 24 hours at 40C and relative humidity of 952%, and stored for 2 hours at room temperature of 20C and relative humidity of 602%, the sensitivity changes within 3dB. note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.