IMPORTANT: We are committed to providing you with the best customer service possible. Please allow us to resolve the issue. We are willing to resolve any issues in an amicable manner. The BLX288/SM58 Wireless Dual Vocal System with two SM58, the industry-standard, highly versatile cardioid dynamic vocal microphone, tailored to deliver warm and clear vocal reproduction combines simple setup and an intuitive interface for performance you can trust. If you’ve ever heard someone sing or speak into a live microphone, there’s an excellent chance it was an SM58. Immortal words have passed through its iconic grille for generations. And with engineering and durability that set the world standard, it’s sure to keep turning up at legendary performances. The Shure SM58 is a unidirectional (cardioid) dynamic vocal microphone for professional vocal use in sound reinforcement and studio recording. A highly effective, built-in, spherical filter minimizes wind and breath “pop” noise. The SM58 has a tailored vocal response for a sound which is a world standard. Outdoors or indoors, singing or speech, the SM58 is the overwhelming choice of professionals worldwide. Shure BLX288/SM58 Wireless Dual Vocal System Features. Performance tested, industry standard SM58 Microphone. Uniform cardioid pick-up pattern for maximum gain before feedback and excellent rejection of off-axis sound. Tailored frequency response specifically shaped for vocals, with brightened midrange and bass roll off to control proximity effect. Advanced pneumatic shock mount system that minimizes transmission of mechanical noise and vibration. Steel-mesh grille and enamel-coated metal construction resist wear and abuse. Effective built in pop-filter reduces undesirable wind and breathe noise. Furnished with break-resistant stand adapter. Extremely durable under the heaviest use. Shure quality, ruggedness and reliability. Working Range: 91 m (300 ft) Line of Sight Actual range depends on RF signal absorption, reflection and interference. Audio Frequency Response: 50 to 15,000 Hz (Dependent on microphone type). Total Harmonic Distortion Ref. ±33 kHz deviation with 1 kHz tone: 0.5%, typical. Dynamic Range: 100 dB, A-weighted, typical. Operating Temperature: -18°C (0°F) to 57°C (135°F) Battery characteristics may limit this range. BLX88 Dual Wireless Receiver. XLR connector: 200? 6.35 mm (1/4) connector: 50? Audio Output Level Ref. ±33 kHz deviation with 1 kHz tone. XLR connector: -27 dBV (into 100 k? Load). 6.35 mm (1/4) connector: -13 dBV (into 100 k? Load). RF Sensitivity: -105 dBm for 12 dB SINAD, typical Image Rejection: >50 dB, typical Dimensions: 1.50 in. X 12.13 in. (38 mm X 308 mm X 101 mm) H x W x D Weight: 15.1 oz. Type: Dynamic (moving coil). Frequency Response: 50 to 15,000 Hz. Output Impedance: 300? Sensitivity (at 1 kHz, open circuit voltage): -56.0 dBV/Pa (1 Pa=94 dB SPL) (1.6 mV). Polarity: Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3. Net Weight: 0.33 kg (0.72 lb). Connector: Three-pin professional audio (XLR), male. Housing: Dark gray, enamel-painted, die cast metal; matte-finished, silver colored, spherical steel mesh grille. Each BLX288/SM58 Retail Box Includes. (1) Shure BLX88 Dual Wireless Receiver (J11 Band) (2) Shure BLX2/PG58 Handheld Transmitters with PG58 Capsules (J11 Band) (2) Microphone Clips (4) AA Batteries (2) A25D Swivel Stand Adapters (1) PS24 Power Supply (1) 31B1856 Thread Adapter (1) User Guide. This restriction also applies to a fault that has arisen as a result of improper repairs by a service partner authorized by us.