Thanks for asking. The BMC-1 with the standard sensitivity option and BMC-2 use the exact same mic elements so the only difference is the housing. The BMC-2 is in a rubber holder about the size of a jelly bean. The BMC-1 is just covered in rubber tubing, which is very strong, but makes the mic smaller. Lastly, the BMC-1 is also avalable in a high sensitivity version, which has lower self noise and more sensitivity. THis is not available on the BMC-2. Hope this helps! Chris Carfagno The Sound Professionals, Inc. 800-213-3021 www.soundprofessionals.com