Grandstream HD High-Tier DECT Handset DP730Supports a range of up to 400 meters outdoors and 50 meters indoors when used with the DP752 (300 meters outdoors when used with DP750) 2. 4 inch (240x320) color LCD with 3 programmable soft keys Offers 40 hour talk time and 500 hour standby time Supports up to 10 SIP accounts and 10 lines per handset as well as 3 way conferencing Dedicated push to talk button, built in proximity and accelerometer sensors for gesture control and alert notification HD