A. Completely wireless operation. It needs no installation nor an installer.(diy)
b. Works with or without electricity. It has a very powerful li-ion inbuilt battery that powers the system at power failure. Fully charged the system can stay on for 6 days, on operation the system can stay powered on for over 12 hours.
C. The communication range/distance of 200 to 300m depending the environment
d. It has 100 units extension from 0 to 99. All set is preset with numbers from 0 to 99. No further coding or setting is required, just place and call.
E. It is designed to be placed or mounted on any surface, horizontally on any wall surface or vertically on any flat surface.
Specifications:
1.Using 2.4g ism public frequency band: 2402-2483mhz
2.Air transfer rate: 250k
3.Transmitting power: less then 20dbm