Here's a pair of consecutive serial number Sony ECM-22P Electret Condenser Microphones from the 1970's! These small diaphragm condenser microphones run on phantom power, and sound great for the price. Generally, these microphones have issues with noisy switches however they have been bypassed for much better functionality. Overall they have a flat sound that is best for drum overheads, acoustic guitars, and more. Note that these microphones have a generally high noise floor, and may be best for high SPL sources. These are consecutive serial numbers 4303 and 4304! If you've been looking for a low cost condenser microphone option, these are for you! Grab this pair of ECM-22P's from Sony!