AT&T DECT EL52100 - Manual (Page 29)

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Technical specifications
RF frequency band 92.536MHz – 928.448MHz
Channels 5
Operating temperature 32°F – 22°F
0°C – 50°C
Telephone base voltage
(AC voltage, 60Hz) 96 – 30Vrms
Telephone base voltage
(DC adapter output) 6VDC @400mA
Handset voltage 2.4 – 3.2VDC
Operating times* Talk time (handset): up to seven hours
Talk time (speakerphone): up to four hours
Standby: up to five days
* Operating times vary depending on your actual use and the age of the battery.