Wireless DECT Handset W56H: The Yealink W56H Wireless DECT Handset is a premium phone designed with robust hardware, ideal for businesses that require greater capability to handle a heavy call load. It is also compatible with Microsoft SIP Gateway, enabling seamless Teams communication experiences. HD Audio Quality: Based on wireless DECT standard to offer premium and stable HD audio quality for efficient and clear communication. Long - life Battery: Installed with a Li-ion battery(V0-V3): Up to 30 hours talking time; up to 400 hours standby time (in ideal conditions) ; (V4): Up to 30 hours talking time; up to 350 hours standby time (in ideal conditions). Rich Features: Enables quick user adoption and natural integration into the working environment with a thoughtful industry design, 2.4" 240x320 color display and rich telephony features.