AT&T AT3101 - Manual (Page 34)

Appendix
31
Telephone operating range
This cordless telephone operates with the maximum power
allowed by the Federal Communications Commission (FCC). Even
so, the handset(s) and telephone base can communicate over
only a certain distance - which can vary with the locations of the
telephone base and handset(s), the weather, the layout, and the
construction of your home or office.
Technical specifications
Accessory handset
charger output
voltage DC6V @200mA
Handset battery DC2.4V 600mAH (NiMH)
DECT 6.0 digital technology
This technology digitally transmits your voice across multiple
channels using the newly available DECT 6.0 frequency band.
This technology provides superior quality of voice and sound,
high protection against wiretapping and better range than
2.4 GHz and 5.8 GHz phone systems, while not interfering with
wireless routers.