Sofeno SPH420 is the over-the-head style headset which is made for office worker, SOHO, or call center staff who using the IP Phone. It is RJ9 connection and it is compliant with the full range of popular IP Phone brands like Yealink, Fanvil and Grandstream. The Sofeno SPH420, available in monaural (SPH420 Mono) and binaural (SPH420 Dual), is a professional RJ9 wired headset with crystal clear audio. The great benefits of the SUH420 is apparent at first sight: Unlike some bulky and large headsets, the SPH420 is compact and lightweight, making it ideal for all-day wear. The padded headband and ultra-soft leatherette ear cushions enhancing the comfort. The headset is fully adjustable with a 340° flexible microphone boom and 180° pivoting speakers. It’s suitable for users who spend a lot of time wearing headsets for conversation.