HT301/HT302 is a RJ9 headset which is specially designed for call center and office communication. HT301/HT302 supports passive noise reduction technology, offering an immersive HD audio experience. Streamlined ergonomic design, soft leather ear cushions and ultra-lightweight provide all-day comfort for you to wear. You can choose theHT301 mono headset or the HT302 dual headset according to your preference, both of which support connecting to Fanvil IP phones and third-party mainstream IP phones.