SC 75 Sennheiser SC 75 is a double-sided, wired headset with 3.5 mm jack, allowing connection to mobile devices such as smartphones and tablets. A headset solution optimized for mobile office professionals. Sound leadership With Sennheiser Voice Clarity and a noisecancelling microphone, the SC 75 optimizes speech intelligibility in noisy environments to deliver a more natural conversational experience during calls for both caller and listener. Quality design With its contemporary styling, the SC 75 looks good from front-desk to video call. A lightweight headband with leatherette padding flexes and adjusts for a personalized fit and a bendable boom arm positions the microphone perfectly.