Eugenius Durafon Pro HC compatible with durafon pro systems, DuraWalkie Handsets. Each integrated Pro system can support up to 90 handsets on 1 base. The handsets functions as a telephone or two-way radio, with feature such as speaker phone, full duplex intercom, and half duplex broadcasting. Receive 6 hours of talk time and 50 hours of standby time. The 4-line backlit LCD display make text messaging, caller id and phonebook directory (90 name/user can be save to directory) appear clear and easy to read.