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The Shure SM57 boasts wide frequency response (40Hz-15kHz) and a tight cardioid polar pattern that are ideal for close-in speaker miking. 
Features: 
- Natural sounding 
- Durable bulletproof design 
- Used widely in studios as well as on stage 
- Frequency response: 40Hz-15kHz 
- Tight cardioid polar pattern 
Specifications: 
- Frequency response: 40Hz to 15,000Hz 
- Polar pattern: Unidirectional (cardioid), rotationally symmetrical about microphone axis, uniform with frequency 
- Sensitivity (at 1,000Hz): Open circuit voltage: -56.0 dBV/Pa (1.6 mV) (Note: 1 Pa = 94dB SPL) 
- Impedance: Rated impedance is 150ohms (310ohms actual) for connection to microphone inputs rated low impedance 
- Polarity: Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3 
- Connector: 3-pin professional audio connector (male XLR type) 
- Dimensions: 1-1/4″W (top) x 6-3/18″L x 29/32″ (bottom) 
- Net weight (without cable): 284g (10 oz.)