Description SINTECH Master Telephone Set KP-O7A is a high-end solution for large PABX systems with advanced navigation, programmable keys, and callback. 📺 3.5 inch big screen LCD display 📞 Out-call & in-call holding with call retake 🧠 30 programmable function keys 🧭 4 navigation buttons 🔌 Compatible with HK & DK series PABX 🔁 Intelligent redial / callback 🔒 Personal password protection 📅 Calendar, date, time, and week display