7 inch (1024 x 600) capacitive adjustable touch screen 720p30 HD video Runs Android 5.1.1 Yealink Noise Proof Technology Yealink's SDK (Software Development Kit) DoorPhone Features (Preview, One-button Open, Monitoring) Built-in Bluetooth 4.2 for headsets and pairing mobile devices Built-in 2.4G/5G Wi-Fi (802.11a/b/g/n/ac) USB 2.0 port (2.0 compliant) for USB headset, media and storage applications Opus Codec support Up to 16 VoIP accounts Up to 3-party video conferencing Up to 10-party video/audio mixed conferencing (up to 2 video calls) Wall mountable Color-screen Expansion Module support Key Features and Benefits The Yealink SIP-T58A is a simple-to-use smart business phone that provides an enriched HD audio and video calling experience for business professionals. This smart business phone enables productivity-enhancing visual communication with the ease of a standard phone. Based on Android 5.1.1 operating system, the SIP-T58A features a seven-inch adjustable multi-point touch screen, integrated 2.4G/5G Wi Fi and Bluetooth 4.2, and it is coupled with a built-in web browser, calendar, recorder and more, which also supports the installation of third-party applications for business customization. More than that, you can easily turn your SIP-T58A smart business phone into a video phone ready with an optional removable two-megapixel HD camera CAM50. Thanks to the DECT technology, if you want to expand your horizons for busy environments, or, share one phone system with your small team by adding multiple handsets, simply turn Yealink SIP T58A phone to the corded-cordless phone, and it will repay you up to 4 DECT handsets in total to meet your daily demands. The Yealink SIP-T58A Smart Business Phone strikes an exquisite balance between simplicity and sophistication, offering an all-in-one communications solution for today's busy executives, managers and teleworkers.