Impedance Transformer, XLR3 Female to 1/4" Male, to correct mismatched impedances / signal loss between microphone and amplifying / capturing devices; i.e. vocal mic plugged into a guitar-type amp
🛒 More audio essentials for all your music making and sharing needs (hotlinks below might be disabled viewing Reverb in phone browsers):
♫   Hosa's versatile 100-240VAC travel-ready Universal Power Adapter
♫   Hosa 1/4" Stereo Female-3.5mm Male: turn ur big headphone jack into the small one
♫   Hosa 3.5mm Stereo Male-2X 1/4" Female: adapt portable devices into mix-boards, combo amps, etc.
♫   Hosa's standard cable for plugging your personal device into car stereo
♫   XLR-XLR(F) Gender Bender: Converts Male XLR into Female XLR
♫   XLR-XLR(M) Gender Bender: Converts Female XLR into Male XLR
♫   Hosa 3.5mm (M) to 2X RCA L/R (F): Nifty adaptor for personal devices-into-home stereo systems, etc.
♫   Hosa 1/4" Cable Coupler: connect two shorter instrument or speaker cables to make a longer one!
♫   Hosa 1FT Piggyback Pigtail Daisy-chain power cord
♫   Hosa HEAVY DUTY Power Cord, Standard for Amps and Musical Instruments & Devices
♫   3.5mm-3.5mm stereo cable: Plug your personal device into that car stereo / non-Bluetooth sound system w/mini 3.5mm stereo input!

Shipping & Handling Note: The shipping & handling rates may be significantly impacted by current energy/material/transport situation-costs. The default shipping & handling option here is USPS First Class/Ground delivered in a 7"x5"x3" or similar small-medium standard box to accommodate this single-item/package, unless customer or supply demands otherwise. Faster delivery option(s) available, including Domestic Priority 2-3 Day service, however, First Class USPS is often delivered in 3 days, and typically 4 days to more-rural domestic regions.