Supports a range of up to 400 meters outdoors (with DP755) and 50 meters indoors 1.8 inch (128x160) color TFT LCD with 2 programmable soft keys Offers 50-hour talk time and 500-hour standby time Supports up to 20 SIP accounts and 20 lines per handset as well as 3-way conferencing DECT authentication & encryption technology to protect calls & account Dedicated push-to-talk button Automated provisioning options include TR-069 and XML config files Use with Grandstream?s UCM series of IP PBXs for Zero Config provisioning HD audio to maximize audio quality and clarity; full duplex speakerphone Supports advanced telephony features, including call transfer, call forward, call-waiting, do not disturb, message waiting indication, multi language prompts, flexible dial plan and more