meters indoors when used with the DP752 (300 meters outdoors when used with DP750), 1.8 inch (128x160) color LCD with 2 programmable soft keys, Offers 20 hours talk time and 250 hours standby time, Supports up to 10 SIP accounts and 10 lines per handset as well as 3-way conferencing, Push-to-talk via a configurable button, Seamless 1-touch door control with Grandstream’s GDS