Check the listing for details. CM518H-35 Adjustable Headband Headset Microphone for Sennheiser Wireless System. Color: Black, Condition: New. Listed at 25.90 USD. AV-JEFES CM518H-35 Headset Microphone 3.5mm Lock Screw Connector CM518 is a compact, lightweight adjustable headband headset with a noise canceling electret condenser, boom-mounted microphone. It's one of the answers to the rapidly increasing demand for affordable, trendy, and reliable headset microphones. It's intended used for vocal transmission applications requiring hands-free operation, maximum mobility, and high-quality voice pick up. Compatible with Sennheiser EW, G2, G3, SK100, SK300, and SK500 series. Specifications Element: Electret Condenser Includes Adjustable Headband & Windscreen Directional Characteristics: Noise Canceling Frequency Response: 100 Hz ~ 10,000 Hz Sensitivity: -66 dB +/- 4dB Impedance: 600 ohm Operating Voltage: 1.0V- 10V D.C. Connector: 3.5mm Lock Screw Cord Long: 5 ft Payment options PayPal Preferred Return Policy 1. All return items must be initiated within 30 days of receipt. 2. Buyer must notify us for any return to get RMA# (Return Merchandise Authorization)