Sleek, stylish, and truly inspirational. The Shure 545SD Classic Unidyne Instrument Microphone is the predecessor to the world-famous SM57. Loaded with the legendary Unidyne III capsule, the 545SD boasts that sought-after sound with its own unique signature. With ultra-low handling noise and a cardioid polar pattern with excellent isolation, this vintage icon is ideal for instruments and vocals both on stage and in the studio. The 545SD lets you choose between Low Impedance and High Impedance mode, so no matter what gear you're using, you can hook up your mic with ease. Low Impedance mode is also perfect for driving long cable runs. Plus, with a handy on/off switch, you can quickly silence the mic when it's not in use. The 545SD is more than just a microphone, it's a testament to Shure's unmatched expertise.