The BLX series is Shure’s more affordable analog UHF wireless-mic family. 
• The “24” in BLX24 means: 2 = handheld transmitter, 4 = single-channel receiver. This is a single mic system. 
• “Premium” handheld typically means it uses a well-known capsule (like SM58 or Beta58) on the transmitter, so you’re not just getting a cheap dynamic capsule — you’re getting a professional-quality mic. For BLX24/SM58: The capsule is the legendary SM58, with a cardioid pattern. 
• Frequency response (with SM58): ~ 50 Hz to 15 kHz. 
• Durable construction — SM58 is known for being rugged.
Performance / Audio:
• Dynamic range: ~100 dB (A-weighted). 
• Total Harmonic Distortion: ~0.5% (typical) per spec sheet. 
• Operating temperature: –18°C to +57°C (according to spec sheet)