The Yealink SIP-W80B is a professional SIP DECT telephone system designed for business environments requiring reliable wireless communication. This system supports up to 8 cordless handsets with a single base station, providing comprehensive coverage across office spaces up to 50 meters indoors and 300 meters outdoors. The base unit features dual Ethernet ports for network connectivity and Power over Ethernet (PoE) support, eliminating the need for separate power adapters. Each handset offers a 2.4-inch color display with 128 x 160 pixel resolution and includes a dedicated headset port for hands-free operation. The system supports HD voice quality with wideband audio and features noise cancellation technology for clear conversations even in noisy environments. With support for up to 10 SIP accounts and 5 concurrent calls, this telephone system provides flexible communication options for small to medium-sized businesses. The handsets deliver up to 10 hours of talk time or 150 hours of standby time on a single charge, with a quick charge function that provides 2 hours of usage from just 15 minutes of charging. The system includes an integrated phonebook with capacity for 500 contacts and supports call history logging for up to 200 entries. Security features include 128-bit AES encryption for all wireless communications and support for SRTP secure voice transmission. The base station measures 180 x 150 x 35 mm and weighs 450 g, while each handset measures 148 x 52 x 25 mm and weighs 135 g. This DECT system is compatible with most SIP-based IP PBX systems and includes support for advanced telephony features including call transfer, call waiting, three-way conferencing, and automatic provisioning for easy deployment. The system operates on DECT 6.0 technology in the 1880-1900 MHz frequency range, ensuring interference-free operation alongside Wi-Fi networks and other wireless devices.